Hello, I am continuing a project, call it art for lack of anywhere else to put it, that involves colliding hollow steel and copper boxes and recording the collisions. I film the visuals with old 16mm high speed film cameras, filming at up to 5,000 frames per second - super slow motion. The audio I have been recording using high sampling rates, taking vibration off the skin of the metal boxes using piezo sheet contact mikes (vibration sensors actually). I am running into problems slowing down the audio - I am slowing it down up to 100 times (6.5 fold compounded doublings of length) and the sample length is very gritty and stuttery even when I record at 192 kHz. I tried slowing the audio down through analog methods using a UHER report (4-speed), but after such extreme stretching, the comparative difference between the sounds is barely discernable (it seems the differences are halved every time I stretch it twice!) My end result is slow motion audio-visual of the collisions between the boxes, showing the ripples of impact, which I would very much like to hear.... I found this perfect 1000kHz mono AD converter for recording bats and insects, but it is very pricey - Avisoft-UltraSoundGate 116Hm Does anyone know of any possible avenues of research? AD converters with higher than 192kHz sampling that are not ridiculously expensive? Or DIY options? Or getting someone to make me something up? Or other left-of-field possibilities??? In thanks, Sean.