I play the following instruments:
Roland TD 30 KV drum kit
DSI Prophet 12 Synth
DSI Pro 2 Monophonic Synth
Moog Subphatty synth
I'm using 444 Hz, or if you like Concert A (A3)=444 hz rather than 440 Hz. To achieve this you have to tune UP 16 cents or 16/100ths of a semi-tone. It is VERY noticeable vibe wise and I feel a kind of different excitement when mixing down.