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OMG! What a mesmerizing sound! I'd play this violin for a while, quite annoying, though! =)
Knowing that You're a very inventive person, i guess, You've checked the fine tuner (if ther's one on the D)... So i can only suggest by the sound that this is something in touch the D, that vibrates when string vibrates enough to make it appear. I'd also checked the notch in the nut and replaced the string (or at least take it off and put on again). And by saying all this i definitelly mean that i have no idea what's realy going on there, LOL!
I have a question. It has to do with bowing by the bridge. For whatever reason when I started my teacher would have me bow close to the bridge. I think she was trying to get a louder sound. ( I don't know.. as she didn't tell me).
Anyway.. as time went on I have been told by many to play in the center from the bridge to the fingerboard... as a general statement. Obviously when one knows where to bow for dynamics etc... there is a difference.
I have recently heard, and I was hoping for confirmation or your opinion...
In the higher positions bowing should occur close to the bridge (as a general statement)
Vibrato Desperato.... Desperately seeking vibrato