You can experiment with different resistor values to change the span between  the three triggers.  On 1675-type voice cards, R4 and R5 control the tuning changes between the three sounds.  See this page for more info:
http://www.electrongate.com/dmxfiles/dmxmkii.html

For 1554-type voice cards, it's R12 and R17 that set the range between triggers.
http://www.electrongate.com/dmxfiles/dmxcards.html

To experiment, you could temporarily connect pots in place of these resistors until you find the tuning you want, and then, remove the pots and measure their values, and replace them with resistors of the same value.

Keep in mind that the musical intervals between sounds will change depending on the setting of the voice card main tuning pot.  Set it to mid position and leave it there when doing these experiments.

Good luck,
Paul White

At 05:56 PM 1/26/2012, Nick Zampiello wrote:

while we are on DX/DMX stuffs,

how do i expand the tuning ratio from pad one to pad three on the toms for instance
 
i would love a 5th or 6th from top tom to bottom but the cards aren't doing that as they are...

it would ne cool to be able to tune the middle point to but i'm sure that is way stretching the tech!!!

:-D

Z



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From: Axel Brà ¼mmer <lz303@...>
To: oberheim@yahoogroups.com
Sent: Thursday, January 26, 2012 8:41 PM
Subject: Re: [oberheim] Re: DMX voice cards and chips soon come

 
Thanks for your post...just need a single 1554 card. Believe me ...i tried nearly every combination on my 1675 card. The card does exactly what i configure but the sound is like through a telephone ! Maybe some faulty parts Don't know and to be honest i don't care anymore.

So in the the end i chose to search for a simple 1554 card for the Tamb/Rim sounds. I know from electrongate how to configure the card.

I am able to burn the eproms myself (i have quite a lot of 2732s lying around).

3 other cards in my DMX are the bigger cards (1675) and they work the way they should but this card sounds strange...

So please tell me what you need for a single 1554 card without eprom ...

Thanks in advance...



--- On Fri, 27/1/12, Les Lambert <les_lmbrt@...> wrote:

From: Les Lambert <les_lmbrt@...>

Subject: [oberheim] Re: DMX voice cards and chips soon come

To: "oberheim@yahoogroups.com" <oberheim@yahoogroups.com>

Date: Friday, 27 January, 2012, 2:29

 

I definitely have multiple Perc2 boards, probably the chips too, but read on for fuller exploration.

I have spare cards, but not in my room with me, so no quick fix.

Which attributes do you guys want, is it a 4K or an 8K card or a cymbal

The 1554 is only the pcb number and the chip fitted gets replayed according to the jumper settings and a few diodes and resistors and occasionally a capacitor.

some odd results happen if you just move chips around, not that exciting at the time, before circuits got bent for fun and profit.

I have a case full of these and the chip library I made in the 80s, and am planning on checking through it soon.

I had 7 DMXs at one time ( 9 if you count the first two that got stolen), and kept all the spare cards as I sold them off. Who knows why

Anyway time approaching for a sell-off.

I made custom chips for a few people and lots for my own amusement, just as MIDI was arriving.

Probably pointless now, but I started with the DMX and LM1 sounds and collected anything I could lay my hands on and copied and merged and eq'd and aphex'd

Some of them sounded better after they'd been through the Pro Walkman with Dolby C I thought.

The 80s was very bright , all that SSL, Jason and Kylie, Scritti Politti etc

I'm in London in the UK, cards are in Northern Scotland, but a visit is planned as soon as the icicles melt.

I won't know if the chips are still good until I get the DMX and the cards together again.

The cards are very reliable, as are the factory chips, but a lot of my custom ones failed I think due to incomplete erasure.

I never had a way of computer backup for these back then, but the Prommer would make copies into its memory and you could join lots of EPROM contents together in a chain and put them in a bigger EPROM if you could afford it, as a backup.

No machine would play it obviously, apart from the Prommer.

You have to program a chip to see if it sounds right, the Prommer preview doesn't come close enough.

So I got lots of not-quite what I thought I should have got, then erased them for 30mins and tried again. We had it tough in them days lad.

The DMX is here but suffering switch fatigue, but may be done soon, I mentioned it to the man today while I was visiting my derelict 80s gear at the menders.

Keep me posted with your voice card requirements, I'm not selling the DMX or Prommer, but I have 20 something cards and now only 1 DMX, and the need for interchangeable sounds is served much better now as we know.

Of course I would need to get a reasonable price for them, this stuff is my pension (apparently). Who'd have thought

I can't personally do BIN files, although that's actually easier, as long as you have the chip.

Assuming the prommer still works I could make copies of the sounds I own, but the EPROMs aren't readily available I'd guess.

You'd need single 2732A for the old sounds, single or multiple 2764A for the longer, newer ones.

I fitted a few cards with zif sockets, but there's more to it than that.

Lots of combination of wiring on the cards have to be dealt with. and sample rate choices makes some combinations hard to do

Most EPROMs of these two types worked on the Prommer if they hadn't been blown up.

I have a more recent eraser now, the lamps get dim,which was probably what I'd failed to consider back then.