Here is a set of Peavey PC1600 patches which act as a front panel for the Yamaha 
DX7/TX802 and other Yamaha 6-Operator jobbies.

The patches assume your TX802 is set to a basic channel 1. You will have to set 
your TX802 sysex channel to "1" or "all" (System Setup #4) to match this.

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 
amplitude modulation sensitivity (AMS). The first button selects AMS 0 or 1, the 
second selects 2 or 3 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 9 has the label "Scal Nrm/Frc", this button selects between  
Normal Scaling and Fractional Scaling (simple huh?) with string 1 calling Normal 
Scaling and string 2 calling Fractional Scaling. If the PC1600 display appends 
"=string2" to this button name you have just set the TX802 voice to Fractional 
Scaling. This means that you don't have to see the DX/TX panel to be confident 
of what you are doing, the PC1600 is telling the truth.

If you are short of PC1600 memory with the TX802 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 

If you want to turn an operator off, just set its volume to "0".

There are nine patches:

Op1                  accesses all the parameters for operator 1.
Op2                  ditto for op2
Op3                  ditto for op3
Op4                  ditto for op4
Op5                  ditto for op5
Op6                  ditto for op6

LFO & PEG accesses the parameters common to all operators (mostly the LFO and 
Pitch Envelope Generator (PEG).

Controllers accesses the controller modulation depths/destinations etc.

Pitch Bend & Portamento accesses these parameters. It grieves me that I couldn't 
fit these four faders and one button in elsewhere - just as well the PC1600 
allocates memory dynamically.