Hi Antonio

> How can I make the A100 dynamic in response to the percussion pad i've
> tried with the A119 Envelope follower but I can't make it.

Those pads use piezo pickups, that give a much too short signal, that
the A119 could make a difference from the dynamic playing.

You may try to use the pads output direct as initiating signal for a
resonating filter. This will give drum sounds in the TR808 style for
minimum.
Another possibility could be to feed the pads output to the lower half
of the slew limiter and use the falling edge of the slewlimiter as
Decay-only-envelope.

Florian