trig a sample with an audio sound

[La Tenaille]

Hello,
I'd like to emulate an electronic drum trigger with Usine : trig a percussion sample (let's say a snare drum) with a bass drum sound (from a microphone plugged in my sound card), and the sample volume following the audio sound.
I've tried a few solutions using gate & enveloppe follower, but the result is still weird.
What would be your start point ?
Thanks

[nay-seven]

You have tested the patches in modules/analysis..?
like the beat follower+threshold..?

[La Tenaille]

Nice, exactly what I need !
For the velocity, I've tried sending dB from enveloppe follower through a pass event flow triggered with the beat, then to the sampler gain. It works quite fine.
Thanks Nay