Unscripted live comparison of chipsynth OPS7 with an original mk1

We briefly explain how to set up the SYSEX librarian mode of chipsynth OPS7, Bidule and a spectrum analyzer to do a random preset comparison between OPS7 and an OG mk1

For hardware comparison, one should list all the details of the test setup.
The exact model of DX7, its firmware version (yes it matters see my video) and all settings in the OPS7 settings page. We claim high accuracy only with:

A physical DX7 mk1 with firmware 1.8 (set "Newer firmware" in settings or "Older" if its not - we do not have all variants)
(Not a DX7II/FD/S, they will sound different, how much depends on the preset)

In OPS7 Settings:
DAC Bits : 10~12:2 (its the default)
DAC error set to taste with just a sine wave (between 1 to 3 is usually good)
Filtering to whatever fits the list with YOUR DX7 (you might want to try with a bright/noisy sound and a spectrum analyzer)
Chan Mix: Accurate, but should matter that much
Vel Mode: **CRUCIAL**: set to External if you feed your DX7 with external MIDI, or Internal if you play the DX7's keyboard and send its MIDI out to OPS7. This particular hot topic also plagued other comparison with other plugins in the past. To be fair, it is very important for Velocity scaling levels

Also please record your DX7mk1 in mono.

If after all this you find a preset that doesn't sound or behave the same, please get in touch and provide us with a syx file. We would gladly investigate.

Thanks to Joan Touzet for her TX816 tests

Product page:
https://plogue.com/products/chipsynth...

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