If I understand you correctly, you are looking to clock/trigger your modular via an audio out of the OT? sorry just a little confused - I have no idea what the impulse wave form in the OT is…

anyhow, a sampled rim shot is your friend, you’ll need to make sure that you can amplify it to at least 2.5v - however I assume that won’t be a problem within the OT.

In terms of using the micro timing function, are you lookin to generate a clock signal (e.g. rim shot on every 16th) to sync a modular sequencer or are you looking for Octatrack to trigger your VCA?

Personally, I would use the rim shot at the steps you want your modular to be triggered on (rim shot sample into env>amp etc) - this approach the micro timing will work wonderfully. However if you’d prefer to output a “clock” signal to sync sequencer you probably won’t find the micro timing as useful - maybe not though