Hi Guys,
I think what you want to do here is look into the functions, search for the Local function and set it to Off.
That way, you should hear the VST sound without hearing the keyboard Main or Dual or Split voice.
Also, I think you must set the function Keyboard Out to Yes (so that the keyboard will control the VST).
There must also be a setting to adjust the volume of the USB Audio input but I cannot tell you because I Haven’t the E463 (yet
)
N.B.: I tried to control the Korg iM1 iOS virtual synth for iPad with my older PSR E433 and it worked like a charm, no latency at all. Since there is no Aux In and no USB Audio in the PSR E433, of course the sound output from the iPad cannot be redirected to the keyboard (you must either use an external speaker or a PA system or the iPad internal speakers).
So I have a threefold hypothesis:
1) There is some latency as far as the USB Audio internal interface of the E463 is concerned.
2) There is more latency with a PC than with an iPad (iOS machines are well-known for their very low latency).
3) The latency is coming from a driver, or possibly from the VST itself.
A detail which might be of interest: I was able to control the iM1 virtual synth by using the PSR E433 onboard arpeggiator. This is really cool
Hope this helps,
Regards,
Vinciane