Synthesizers

A little more experimentation and I've found the ADSR envelope stays almost flat with all sliders down if it's triggered via a 5V gate to the Gate input. There is still the tiniest bump when triggered this way, but nothing close to the effect of the manual gate button. Triggering via MIDI seems to behave more like pressing the manual gate button.

The other interesting thing I discovered is that the LFO 'leaks' into the VCO1 FM mod, even with the vibrato depth and LFO FM mod on VCO1 all the way down. The solution is to plug a dummy patch cable into the "Ext Vib In" input. This seems to break the normalling of the LFO in the right place to prevent this leakage (plugging a dummy cable into LFO FM mod on VCO1 didn't work, which must say something about the signal path the LFO is taking to leak into the VCO1 freq modulation).

One thing I've noticed about the 2600 (and I doubt this is unique to the BARP clone) is there are a lot of signal paths that aren't buffered or isolated like you might expect in a heavily engineered Eurorack module or modern semi-modular. Sometimes it provides interesting character, other times it shows the compromises of it's age and feels a bit broken by modern expectations.