Here is a set of Peavey PC1600 patches which act as a front panel for the Yamaha 
TX81Z.

The patches assume your TX81Z is set to a basic channel 1. You will have to set 
your TX81Z to match this or to "Omni".

I have a habit of using buttons for parameters where the range doesn't exceed 
about 8, thus saving a fader for more useful work. This means that some of the 
buttons work in multiples. For example four buttons are used to select the 
algorithm. The first button selects algorithm 1 or 2, the second selects 3 or 4 
etc. etc.

Each fader/button is appropriately named. For buttons with toggle action the 
name hints at which function is accessed by string 1 and which by string 2. For 
example button 7 has the "Algorithm 3/4", this button selects between algorithm 
3 & 4 (simple huh?) with string 1 calling algorithm 3 and string 2 calling 
algorithm 4. If the PC1600 display appends "=string2" to this button name you 
have just set the TX81Z voice to algorithm 4.

If you are short of memory with TX81Z patches, you may want to edit all the 
faders/buttons and remove the names which will save a bunch (in my experience a 
British Standard Bunch is approximately 250 units in the "memory free" display), 
but then you'll probably need to make up a card template to remind you where 
everything is. I will get round to putting some templates for printing out on my 
web site in due course (May 99?), so check that out (it'll be in the "synth" 
area of the site):

http://www.gozen.demon.co.uk/godric/godric.html      or
http://www.kingston.ac.uk/~mu_s454/godric/godric.html 

The most tricky thing I have found about setting up this patch group is how to 
address the problem of turning operators on and off. Yamaha combine the operator 
on/off settings into a single nibble. In order to turn, say,  operator 3 off, 
you need to find out how ops. 1, 2 & 4 are set and then send a nibble with bit 3 
set to "0" and the other three bits set as they were before. This is too much 
brain hurt for the PC1600. I thought of using a fader to choose from all 16 
possible permutations, but a user would have to do binary to decimal conversion 
in their head, so I passed on that.

What I have done is emulate the five rightmost buttons of the TX81Z front panel 
in the rightmost five buttons (12 to 16 inc.) of each of the PC1600 patches, 
except the LFO & Mods patch. This means that you can do the same thing on the 
PC1600 that you would on the TX81Z itself, that is, select cursor mode nip over 
to the top left of the TX81Z display and then use the inc/dec buttons (12, 13 on 
the PC1600) to turn the operators on/off individually in the usual manner. The 
inc/dec buttons will also adjust parameters in the usual way and you can use the 
buttons 14/15 to adjust the master volume if you turn the cursor mode off 
(button 16) - I hope this is all clear.


There are five patches:

Op1                  accesses all the parameters for operator 1, plus algorithm, 
feedback and transpose, and front panel emulation. Button 10 has no function *
Op2                  ditto
Op3                  ditto
Op4                  ditto
LFO & Mods.  accesses the parameters common to all operators (mostly the LFO and 
modulation depths/destinations etc. No front panel emulation.

* On Op1 Yamaha disable the level shift, so buttons 1 & 2 in this patch have no 
function.