compiles now, but is not fully tested
Skip this commit to avoid changing current behaviour
instead of determining which component was clicked on, we're now looking fo rthe channel closest to the mouse y. This allows larger channeloverlap, so there are fewer cases where the data get clipped.
just changed SAMPLES_PER_DATA_BLOCK back to 300, this probably requires a real bug fix somewhere else, not sure why this is an issue.
