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ChromaTalk Archives: February 2012

Last of the CPS Kits

Go to first message in thread, January 2012

Murray Macdonald [21030276+]

Hi Chris,

I'll take two. I'm in Vancouver, Canada. Please let me know how to pay you.

Ian Hamilton [21010150]

Hi Chris,

Count me in for a CPS kit of any are available.

Ian in Adelaide, Australia.

Michael Grossman [21030350]

Chris, please add me to the list for one CPS kit. I live in San Diego, CA.

Chris Borman [21030194+]

Sure thing Mike, I'll send an invoice.

Chris Borman [21030194+]

I'll take two. I'm in Vancouver, Canada. Please let me know how to pay you.

Hi Murray,

Still Interested in buying two CPS Kits?

Chris Borman [21030194+]

Chroma Folks, I have 8 fully assembled and tested CPS Kits ready to ship. 4 sold and paid for. 2 pending sale. 2 available. I have the parts to complete one more if needed.

Send me an email if anyone has interest in these last few CPS kits.

Edward Chen [21030674]

Hi Chris

You can count me in for 1 of the 2 available.

Mirko Lüthge [21010245+]

Hi Chris,

I would like to get one too, Mirko Lüthge Germany

best wishes

Tero Koski

Hello

I would be interested on this CPS kit too. But it seems, that all the packs are sold out already.

Murray Macdonald [21030276+]

Hi Chris,

I sure am.

Chris Borman [21030194+]

I sent you an invoice. just need to pat it. Kits are ready to ship.

Chris Borman [21030194+]

pat it...

Mirko Lüthge [21010245+]

Hi Chris,

I am sure too, I need one.

Mirko Lüthge [21010245+]

Hi Chris,

I sent you the money via paypal. Your provider comcast.net blocks my address. I can't send a message directly to you.

error:

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: [rest of message removed]

Chris Borman [21030194+]

Just like the Chroma personal computers are great when they work properly...

Go to next message in thread, April 2012

Invading the list with a Rhodes demand :)

Odysséas Tsakas-Grigoriadis [21010242]

Hello list,

I had a thought of asking all of you first, before taking my chances on ebay, craigslist, etc.. Is there someone who has a fender rhodes mark V 73, willing to sell it to me? Also, I am selling an ensoniq ts10 keyboard, and a hohner duo (pianet-clavinet). Both in good cosmetic condition, but both work 110%, so if you are interested please let me know. I live in Greece by the way!

Chris, please let me know if you think that this message is inapropriate for the list. If someone is interested, please send direct message to my email address

Thanks!

Luca Sasdelli [21010226]

Hi Odysseas,

within the biggest instrument exchange site in Italy, there is one at 3 thousand Euros: [link from mercatinomusicale.com removed] (be aware: I've bought and sold several items there, but there isn't any "trustee" mechanism like eBay, so you have to take all needed precautions before paying anybody)

Due to the instruments you offer, I guess you're looking for a genuine Rhodes for your collection, isn't it? Just in case you indend to play around with it, in the past I had a Rhodes 88, great instrument, but it was 75kg and to move it I needed 3 people and a van. Currently there are quite good emulations, e.g. the Clavia Nord Electro, Nord Stage etc. or the Korg SV-1, very light and robust indeed.

I own a NE2-73 and, although the keyboard is a semi-weighted one, I feel it really close to the real thing; with a decent weighted master keyboard (e.g. my Oberheim MC1000-88) is definitely the same feel and timbre.

Yust my 2 cents

Cheers

Odysséas Tsakas-Grigoriadis [21010242]

Hi Luca,

Thank you for the infos about the mercatino site, I had forgotten it's existence (shame on me as it is the site where I found my Chroma :) ). I'll check it now and then hoping to find a rhodes at a more decent price.

I do am looking for a genuine rhodes, which I intent to place in my studio. When I play outside, I prefer the use of lighter instruments (for the weight as you said).

Thank you for taking the time to respond Luca, hope everything is going ok for you in Italy!

Luca Sasdelli [21010226]

Hi Odysseas,

once logged on the Mercatino, you can subscribe the "Update me" service.

You can enter a search string as you like, and the system will email you when a similar string appears in the new entries, so you'll be updated as soon as a user will post a sale of your interest.

About "everything is going ok in Italy", well... sometimes it seems our country is trying to mimic your one :)

Chromas on sale in Italy

Luca Sasdelli [21010226]

[mercatinomusicale.com items 2199110 and 2372515]

MIDI mode 4 in the next Chroma CC+ ???

Arun Majumdar [21030348]

Maybe this is dumb question but does or can the Chroma suport Midi mode 4 in the newest ROM updates for *sending* polyphonic pressure?

I am asking because I use a Prophet-T8 and a Haken Continuum as my polyphonic pressure per midi-channel in Midi-Mode-4 to my modular system which needs seperate midi channels per note, with pressure data per midi channel per note --- so the maximum is 16 note polyphony with pressure though in practice, it is really *FOUR* NOTE poly-midi-per-note with time varying pressure (after that, you can hear the difference).

Any response welcome.

Thanks!

David Clarke [21030085++]

... can the Chroma suport Midi mode 4 in the newest ROM updates for *sending* polyphonic pressure?

As I understand it, MIDI Mode 4 is "Omni Off/Mono", and so that means the device will play only one note at a time on 1 (or more) specific MIDI channels.

If you have the Chroma set up to run in Mono mode (e.g., if the patch being used has parameter 3, Keyboard Algorithm, set to 4 or higher), then you'll only get mono mode (1 note sounding).

The Chroma will always transmit on a specific channel.

If you are running with a link/split patch, then you're able to transmit on two channels - either at the same time, or one for the notes below a split point, and one for the notes above a split point.

The behaviour above should be pretty common across the standard MIDI interfaces for the Chroma.

Arun Majumdar [21030348]

Hi,

The Prophet sends out, when you hit for example up to 8 notes:

Mono Midi Channels 1 through 8 and each mono channel has mono pressure: the result is polyphony since when you hit a chord, you are sending that many voice as midi channels of data.

Can Chroma CC+ do this? In other words, if I hit a six note chord on the Chroma, I would get out:

Midi-Channels 1 thru 6 with aftertouch channel pressure messages for each channel being sent out of the Chroma CC+

It is just a mapping from Poly mode to a poly "monophonic" transmission. So instead of transmitting all notes on one midi channel, you get a channel per note being transmitted.

Any help is appreciated.

David Clarke [21030085++]

... Can Chroma CC+ do this? In other words, if I hit a six note chord on the Chroma, I would get out:

Midi-Channels 1 thru 6 with aftertouch channel pressure messages for each channel being sent out of the Chroma CC+

Today, no - the Chroma can't do this. The Chroma will normally transmit only on 1 MIDI channel or 2 if a link program is being used.

Chris Smalt [21010280+]

if I hit a six note chord on the Chroma, I would get out:

Midi-Channels 1 thru 6 with aftertouch channel pressure messages for each channel being sent out of the Chroma CC+

I remember the remapping function of Opcode's Vision [mailing list] could do this. It was called "round robin". So by setting up 6 (or 8) monophonic through-instruments, you could route each subsequent note to another midi destination, with its own controller mapping. I miss Vision's features most every day, and sometimes fire up an old Mac to run it.

Arun Majumdar [21030348]

Hi David,

As an FYI, I was able to connect a poly-pressure output to MAX and then *remap* each key through the circular list of 16 midi channels by remaping single channel polypressure into pressure per channel out. However, this was a Max hack. I am wondering if the Chroma CC+ firmware could be altered to do the same in that sort of Midi mode?

As an example, the Continuum Fingerboard assigns each finger on the playing surface its own Midi channel as does the Prophet-T8 (it treats its internal synths as 8-monophonic synths). By default they tracks 8 fingers, using Midi channels 1-8 but the Haken may be configured to track between 1 and up to 16 fingers (ex. duets on the larger version of the keyboard). I understand that the VAX77 can also do this. The Andromeda, for poly-pressure, has to be configured as 8-mono's or 16-mono synths for 8 and 16 note pressure receiving respectively so the only keyboards to use are the T8 or the Haken. It would be great to use the Chroma.

I could try my hand at assembly coding the routines but it's pretty simple. Here it is in pseudo-code:

foreach Keypress event
   if current channel is N,
       then NewChannel is N + 1 mod 8
           Send Keypress on NewChannel to MidiOut
repeat

Essentially the code just uses the modulus operator to allocate the keypress (I assume a data buffer with velocity and pressure information) and sends that out on the MidiOut.

I hope this helps make it a bit clearer. So the Chroma would transmit, 4 or 8 or 16 monophonic pressure and velocity values, one for each midi-channel, on MidiOut.

Any reactions as the to the feasibility are welcome.

Thanks!

Arun

Anyone in the Boston area could help me out with an EPROM burn?

Heath Finnie [21030175]

My Chroma has CC+ version 213 right now, but I want to get it to 216. Can anyone help me out?

Chris Smalt [21010280+]

I found this, looks like an old site, not sure if they still work.

David Clarke [21030085++]

My Chroma has CC+ version 213 right now, but I want to get it to 216. Can anyone help me out?

Heath - were you able to get yourself sorted out regarding going to 216?

Luca Sasdelli [21010226]

Hi Dave,

I'm just shipping a SPSU kit for Heath and I've included a programmed EPROM too as we agreed earlier.

Heath Finnie [21030175]

Yes, thank you. I'm all set.

Chroma on german ebay

Jesper Ödemark [21010135]

Not sure if we've seen this before: [eBay item #190634617215]

4000 euros, no midi and sadly no pics

The auction ended shortly after Jesper's email was sent, apparently without being sold on eBay.

Man I wish all the Chromas had the Halloween panel

Heath Finnie [21030175]

I just love the look of them and like how it separates the sections by color. So much more useful when trying to do quick glances. Wish I could find one to replace my standard panel.

Eric W. Mattei [21030443+]

Me too! But I'm not in a position to buy another Chroma.

Doug Wellington [21030300]

How many people are interested?

I just love the look of them and like how it separates the sections by color. So much more useful when trying to do quick glances. Wish I could find one to replace my standard panel.

So, just for grins, how many people would be interested in a different panel? I've been building my own expander and working out details of the front panel. If enough people are interested, it might be worth making a batch...

David Gowin [21030611]

Re: How many people are interested?

I'm in for a a Halloween front panel

Paul DeRocco [21030230]

Re: How many people are interested?

So, just for grins, how many people would be interested in a different panel? I've been building my own expander and working out details of the front panel. If enough people are interested, it might be worth making a batch...

I'm not convinced that you could merely overlay a new graphics layer on the old one without making the switches hard to press. And the cost of completely new membrane switches is prohibitive unless you can expect to sell dozens of them. (I'm doing the Polaris ones now.) So the question is: is it possible to remove the old graphics layer without delaminating the underlying switch layers?

On the other hand, with some more expensive tooling, you could make a graphics layer that had rectangular holes where the white-on-black switch names or numbers are. Then you could overlay the old graphics without increasing the switch force, and the holes would help your finger feel the switch location.

Christian Kleine [21030210]

Re: How many people are interested?

Hi Doug,

I'd be interested but it depends somwhat on the overall costs - do you have any rough figure?

Thanks!

Doug Wellington [21030300]

Re: How many people are interested?

Hiya Christian,

I'd be interested but it depends somwhat on the overall costs - do you have any rough figure?

I'm still on my latest business trip. I'll be back home and looking into the cost next week.

I am considering several options. As previously mentioned, one idea is to just make a new label to cover the existing panel. Another is to make a completely new overlay. The advantage of a new overlay is that the buttons can be moved around and grouped. The other option I'm considering is to completely redo the front panel and add more controls and a space for the optional LCD. I don't know if that will be cost effective for most people, since it involves metalwork, not just a new overlay. FWIW, that is probably the route I will take for my own Chroma...

Stay tuned,
Doug

Ron Joseph [21030042+]

Halloween Panels

I own two of the halloween panels as well as the gold overlay. The membrane panels on these are different from the stock membrane panels. The font/graphic size is larger and easier to read. As noted they are grouped differently from the stock panels. There is a mistake on the gold/halloween overlays in that two of the parameters in the 20's are switched. The overlays can be separated from the membrane panels with a bit of work; this is what I had in mind for the gold overlay but due to ribbon issues I never got around to it..... I'd be interested in a few sets myself and I'd be willing to help with development by lending Doug a panel if it would help......Ron

Paul DeRocco [21030230]

Re: How many people are interested?

From: Doug Wellington

I am considering several options. As previously mentioned, one idea is to just make a new label to cover the existing panel. Another is to make a completely new overlay. The advantage of a new overlay is that the buttons can be moved around and grouped. The other option I'm considering is to completely redo the front panel and add more controls and a space for the optional LCD. I don't know if that will be cost effective for most people, since it involves metalwork, not just a new overlay. FWIW, that is probably the route I will take for my own Chroma...

Now you're getting into the territory where it would be more cost-effective (and probably more user-friendly) to write a tablet-based touch-screen controller/editor, and just sit it on top of the Chroma.

Chris Smalt [21010280+]

Re: How many people are interested?

Yeah, or just hum the damn tune ;-)

Doug Wellington [21030300]

Re: How many people are interested?

Hiya Paul,

Now you're getting into the territory where it would be more cost-effective (and probably more user-friendly) to write a tablet-based touch-screen controller/editor, and just sit it on top of the Chroma.

Heehee! You're no fun!

Regards,
Doug

(Next you'll tell me that I should trade in my 100+ analog synth modules for a copy of Reaktor?)

Michael Di Francesco [21040001]

Halloween

Hi, yes please I'll take 2. Thanks

Marais

Re: Halloween

can you replace the eq knobs with stale candy corn ?

Mirko Lüthge [21010245+]

Re: How many people are interested?

Hi there,

good idea, but what about the owner who have also a Chroma expander ?

Luca Sasdelli [21010226]

Re: How many people are interested?

A neck extension?

JL Cooper Chromaface debugging

Brian Fifield [21030920]

Hi,

Is anyone aware of any diagnostics or tricks I can try to see if the Chromaface is actually working? It doesn't have any lights or anything, and I can't seem to get the Chroma to respond to any midi messages. Any advice would be greatly appreciated!

Thanks,
bri

David Clarke [21030085++]

Brian - I'd suggest that the easiest path would be to test the opposite direction. Specifically - if you have a computer/sequencer on the other end with a MIDI monitor running, just check to see if notes are being transmitted from it. If messages go out of the ChromaFace, then you can have confidence that you can make them come in. If you don't see anything going out then some focus may need to be on power to the unit, etc.

August B. Raring [21010148]

Hello Brian,

first of all did you do the SET SPLIT 17 (silly question, I know) ?

When I got my Chromaface (in 1984) it didn´t work and as far as I remember the failure had been a not functioning IC in the Computer-Interface of the Chroma´s I/O board, although it only had been one year old ! The technician told me than that this wasn´t unusual.

So perhaps this might be the reason for malfunctioning of your Chromaface ?

Brian Fifield [21030920]

Hi August,

I did do the set split 17, but to no avail. It seems that it is no longer transmitting or receiving midi data. Nothing is getting into my sequencer midi-wise, so maybe it's finally given up.

Thanks for the advice, guys. Guess it might be time for an upgrade.

Dual channel boards

John Leimseider [21030434++]

I just got 4 more dual channel boards. Two were perfect, the other two were defective and are now repaired. I'd like to sell them ASAP. They are $225 for one or $200 each for 2 or more to the same address. The shipping is additional. The shipping to the US and Canada is reasonable... It is crazy expensive to anywhere else, but if you want to pay for the shipping, I'm fine with shipping them anywhere they are needed. Thanks! JL

Daniel Rickenbach [21010172]

Hi John

I'm still looking for an I/O-board, is there any chance to get one?

thanks

John Leimseider [21030434++]

I have parts for them, but not the whole board. There is nothng on there that's hard to find. The EPROM file is on the Chroma site... I have lots of the ADC's, some of the DACs...

Daniel Rickenbach [21010172]

It's the board (pcb) itself, which has damages, so I try to repair or still wait for a board. But it's also good to know, where I can find some spare parts, if I need some

Re: Chroma 21030360 on eBay

Go to first message in thread, January 2012

Chris Ryan [21030691]

This was relisted as item #280819276094 and sold for USD$4,000.00.

Site Updates

Chris Ryan [21030691]

A couple of minor things:

There have never been a lot of people following the RSS feeds (Chroma, Polaris); I'll continue to update those but I have started a Twitter account, rhodeschroma. If enough people follow me there I'll keep it up.

Although it's difficult to know given Google's personalized search results (of questionable value; see the TED talk Eli Pariser: Beware online "filter bubbles"), it seems the site may have slipped in the search rankings. If you have a Google account and are so inclined, there is now a "+1" button on the home page.

odd behaviour (solved but unexplained)

Jesper Ödemark [21010135]

Hi list,

I stripped 21010135 today and removed the felt stoppers below the keys to test if I felt any difference. I experienced no big difference as my CPS apparently is trimmed to my kind of playing, but while at it I adjusted a few leaves in the trigger section to make all keys respond equally to velocity and pressure.

Then it happened! My favourite patch (a Vangelis-esque design of my own) stopped playing 8 notes of polyphony, but decided 3 was enough. *argh!* I auto-tuned without finding anything wrong. I checked if I'd disturbed the keyboard alg and tested other patches. Some displayed equally odd behaviour with variations in number of sounding voices (2-4). I ignored auto-tune and asked the Chroma to display bad voices. There were none and I went back to my favourite patch (with a very bad feeling inside) and then everything was great again. *big sigh of relief*

It would be very interesting to hear if anyone can shed any light on what might have happened. I grounded myself and didn't notice anything else perculiar during the surgery. I can testify that it's very bad for your heart-rate and general well-being when such things happen. :S

Tom Klepacki [21030025]

A Chroma can be a mysterious instrument, in my opinion. (I can hear all the techies groan at that remark, as a Chroma is but a soldered-together collection of chips, resistors, keys, etc.) When I first got my Chroma new in 1982, the 'seagull birds' in the factory seashore patch [from Factory Set 3] would (every once in a while) fly into unrelated patches, for no reason whatsoever and sing along with the Clav, or the horns, etc. Was it boredom? A desire to have me play the song "Free Bird"? I never did find out.

I liken my Chroma to the Plymouth car in the movie 'Christine'... The car took on a humanoid identity all her own! But I'm sure that the techies in the group will come up with a scientific explanation for that paranormal Chroma behavior.

The birds are now silent. My Chroma lies in her anvil case... dead to the world. Foam rotting away! I WILL someday exhume the old girl, and breathe life once again into her. And see if the birds are still in there. >smile<

Tom Klepacki

#25

Jesper Ödemark [21010135]

WPM Tom's desk skrev 2012-02-15 16:16:

A Chroma can be a mysterious instrument, in my opinion. (I can hear all the techies groan at that remark, as a Chroma is but a soldered-together collection of chips, resistors, keys, etc.) When I first got my Chroma new in 1982, the 'seagull birds' in the factory seashore patch would (every once in a while) /fly/ into unrelated patches, for no reason whatsoever and sing along with the Clav, or the horns, etc. Was it boredom? A desire to have me play the song "Free Bird"? I never did find out.

Love that story - I sure is mysterious in a wonderful way!

I liken my Chroma to the Plymouth car in the movie 'Christine'... The car took on a humanoid identity all her own!

I hope my girl is a bit more OK with my human relationships compared to Christine though. :)

But I'm sure that the techies in the group will come up with a scientific explanation for that paranormal Chroma behavior. The birds are now silent. My Chroma lies in her anvil case... dead to the world. Foam rotting away! I WILL someday exhume the old girl, and breathe life once again into her. And see if the birds are still in there. >smile<

I keep my fingers crossed for the birds to return!

Re: To Chris Borman: Op amps...

Go to first message in thread, January 2012

Michael Grossman [21030350]

I listened to the before and after audio clip on Randel Osborne's website and really could not hear much of a difference between the original 4558 and AD712 opamps. Has anyone actually done the swap and seen a tangible difference?

Marais

This post was sent from a non-subscribed address and I deleted it by mistake, so it wasn't circulated to the list.

one could argue the slightly grittier original version is one of the many things that give the Chroma it's character. If it ain't broke don't fix it school.

Randel Osborne [21030467]

Mike-

The difference is subtle, for sure.

My 45-year-old ears could hear a slight difference, and I'm sure a little bit was lost in the MP3 conversion. Don't expect much!

Luca Sasdelli [21010226]

Hi Mike,

on a customer Chroma, I've replaced the 4558s of Channel Motherboard and EQ Board with Burr-Brown OPA2134As; the overall sound becomed more aggressive and with opened trebles: it does take the instrument out of its own nature, so you could like it or not.

Mirko Lüthge [21010245+]

-> the overall sound becomed more aggressive and with opened trebles: it does take the instrument out of its own nature, so you could like it or not.<-

best way : to get both - switchable

Luca Sasdelli [21010226]

This would need some extra circuitry, using some CMOS switches in order to swap them, and some logic to drive the switching, interfaced with the CPU and firmware. IMHO it's a bit too complex vs. the real benefit.

Much better to experiment by manually swapping OAs on sockets, choosing the ones that better suits own taste.

The involved chips are 6:

  • Z18 and Z19 on CMB
  • Z3, Z4, Z5 and Z5 on EQB

Mirko Lüthge [21010245+]

All is possible - like Toyota says.