Hi,
Sorry for my late answer !
I effectively use the bass_vst.dll. That is what I saw in the "chm help" of Bass.Net (I work with Visual C# Express 2010, on the Framework 3.5) :
using Un4seen.Bass.AddOn.Vst;
using Un4seen.Bass.AddOn.Midi;
int vstHandle = BassVst.BASS_VST_ChannelCreate(44100, 2, "yourVSTi.dll", BASSFlag.BASS_DEFAULT);
BassVst.BASS_VST_ProcessEvent(vstHandle, 0, BASSMIDIEvent.MIDI_EVENT_NOTE, Utils.MakeWord(60, 100));
...about the
BASS_VST_ProcessEvent method
One find the same for the "sysex version" of the
BASS_VST_ProcessEventRaw method
Best regards
Bernard