Originally Posted by rhythmcomposer ➡️

Interesting question as I wondered about just the same thing today (I'm trying to compare a DX-7 (original version) with a TX-802 using the same patches as I've heard there are differences), so I did almost what you suggested here.
What I did was press the "Voice select" button, then chose the single patch as only the leftmost one. The display now looks like this:

I01 <-- <-- <-- <-- <-- <-- <--

It's been a while, but as far as I remember this means you get a 16 voice polyphony for that single patch. You shouldn't select two voices for making it behave like an original DX-7 (that would also mean you lose polyphony, but of course you can layer two (or more) voices (identical or different patches) and "fatten" it up, especially if you detune them slightly from each other.

And an unexpected bonus was that when changing patches on the DX-7 it also changed to the same patch number on the TX-802. It didn't go to another performance as I thought, so that's good news indeed!

As for outputs, press the "Perform edit" button, then button 3 (out) and use the +1/-1 buttons to select: both left and right outputs:

I II <-- <-- <-- <-- <-- <-- <--

I haven't saved the performance yet, as this was just a quick test and I was going to put back the previous patches/performances anyway for now, but your posting got me thinking that this would be a great idea for auditing banks of 32 DX-7 patches, and it doesn't appear to do anything with the other patches (33 and onwards) as well as the performances -because the DX-7 has neither.

Like I said, it's been a while since I last used my TX-802, so in case my information is lacking I hope someone can step in and correct that info.

You mentioned using the Dexed softsynth to load and audit DX-7 sysex patches, but are you saying you're also using it to transfer patches to the TX-802?