Invert phase

I love the Slapper, but If there was a phase inversion switch for each channel,
it would expand the range of sound design.
(For example, for a N-wave as a thunder lightening. )

I’m currently substituting a multi-channel strip for that function, but I think it would be quicker to have it implemented in Slapper if at all possible, so please give it some thought.

best regards.