Lefty waveform

post a pic?

It looks like you're just pushing the diaphragm of the mic a little hard. With loud sources you can get that effect. It shouldn't be a problem, but if it is you can try using a phase rotator to correct it. (I would recommend using for the phase rotator)

I don't know the technical background of it, but with some audio sources it simply seems to happen. Here's a trombone I recorded recently. As Schmidty said, I think no need to worry about, as long as it sounds fine.

The acoustics of brass instruments is pretty interesting ... you can get ... :) ... there's some interesting reading

Thanks for the links. Didn't know about shockwaves (and that trombones can produce these - pretty amazing). btw, anyone knows what's the explaination these waveforms look like in the pic I posted above (significantly center-offseted and even quite unsymmetrical). The explaination is probably somewhere in the second link timlloyd posted, but haven't read it all)

Basically asymmetrical waveforms contain even partials, as long as the asymmetry is not caused by DC offset. It's technically 'half-wave (a)symmetry' iirc though, as even a pure sine isn't symmetrical in amplitude.

cool cool, thanks for the reinforcements ... it all makes sense now :)

You're welcome.