So far the sympathetic resonance of the HP-307 sounds fine...
I agree - I think the HP307 pedal down sympathetic resonance sounds pretty good when it isn't turned up too much i.e. when it is set to a reasonable, realistic level. Beyond that it sounds more like an effect, but even then it doesn't sound bad.
dewster, I'm curious about the 'mosquito noise' - how are you determining that, and would you post a picture? I installed Adobe Audition and was looking at the 'frequency analysis', and was wondering if you were referring to the noise down below 1000Hz, or the entire range (seems more noisy below 1kHz). I did a quick web search on mosquito noise, so maybe I'm misinterpreting or looking at the wrong thing?
Maybe I'm misusing the term. It's non-white noise - a bubbling slurry of tones - rather like the random chatter from a computer in an old science fiction film. I hear it in your files mainly when the recorded sound is getting near the noise floor.
For instance, here is a waveform view of the looping test in the file dpbsd_v1_7b_Roland_HP307_DR5_jmmec.mp3
. The vertical dimension has been greatly zoomed up so we can see the noise floor, and a portion of the C1 note decay is highlighted. In it I can hear something like random tones. Here is an MP3 of the highlighted section, highly compressed so you don't have to turn the volume up:http://www.mediafire.com/?hgagxodtw2j
It could be external noise getting into your signal, or noise from the analog to digital converter on your soundcard or in your digital recorder, or produced somehow by the MP3 conversion process, or it could be coming from the digital to analog converters in your HP307, or from the SN process itself.