here's how i do it: 1st channel: 1.5khz control tone 2nd channel: bits encoded as follows: 0 : 1 3khz cycle 1 : 2 6khz cycles marker: 1 1.5khz cycle so each timecode looks like this: marker cycle encoded 0 checksummed bit sequence encoded 1 marker cycle each one ends up being about 8ms. so my "latency" is better than theirs! [i'm pretty sure finalscratch's 12ms assumes the record is moving at normal speed] since the frequencies are multiples of each other, the crosstalk from the cutting head or even from the cartridge that gets used is mitigated the 0 and 1 starter bits help figure out what's going on depending if the record is playing backwards or forwards counting zero crossings works...but don't forget to filter out the low frequencies [like 80hz and below], since the noise from the person's hand will fuck things up i'm fiending to buy one of the finalscratch control records [the guys at platinum are telling me they're gonna be like 25 dollars], to see what they're doing -- John Ketchpaw kungfu(a)alumni.cmu.edu On Mon, 7 Oct 2002, CK wrote: