Finally got back to tooling around with Goldwave and my various recording set-ups.
Live baby mouse squeak recordings I've made do indeed have elements that are above 22 KHz.
Took the original .wav file and converted it to a 320Kbps/48KHz MP3 (highest quality available under Goldwave using LAME codec). All the sound appears to still be there when looked at with the frequency analyzer function in GW.
But a standard-issue 128 Kbps mp3 was stripping out frequencies above 16KHz.
Although my POGO! Ripflash Plus has a feature to record directly to the device, at 256Kbps/ 48KHz sampling, the internal codec also strips out frequencies above 17KHz. Rats.
All this to say that for high-pitched stuff and/or the richest recordings, best route I've found so far is still to record to a decent PC sound card as a .wav file and then convert to .mp3 at the highest bit and sampling rates. Yes, the files will be somewhat larger, but most of the recent MP3 players have more than enough memory for our predator calling needs.
LionHo
