Wierd looking wave forms in Logic.

Just looks like the input gain on one side is higher than the other.

What's the source of the waveform?

Ahh that makes sense, I'm presuming that it's a stereo pair.

The left side ( from the drummers perspective ) is picking up more from the snare and the high hat, than the right.

Is this a stereo- or a mono-track ?

If it's stereo, then yes, the left side (upper half of the display) is louder than the right side (lower half of display). Possibly causes are: different levels in the recording room, different settings of mic pre, different settings of input tratment (if any).

If it is a mono track, then it seems either the mic or the mic pre is not working correctly. Looking at the body of the wave, it appears the level of positive part of the wave (upper half of the display) is the same as the negative part (lower half of display), but the transients on the negative parts are severely cut off. Dodgy power supply rails spring to mind.

Post a closer zoom if possibly.

Christian

If it's a mono mic/track then there's a DC offset problem that can be got rid either in the Logic sample edit window/functions/remove DC offset, or by applying a high pass filter to the drum overheads whilst recording. ( which you should always do anyway )

Are these drums you are recording yourself?

Is so try a high pass filter on the OH mics and this should stop happening.

Is this happening to everything you record through your preamp?

My money's on one half of the pre-amp stage being defective - either power-supply problem or a defective transistor/valve.

+1 if he can't remove the DC offset.