[linux-audio-user] corrupted midi messages using vstserver

I have just got vstserver up and running (using the recommended ancient
version of wine). The problem I am having is that some midi messages to the
plugins get garbled. What happens is that, if I hit two or more keys
simultaneously on my midi keyboard, one (and only one) of the notes will
continue sounding after the keys have been released. However if I play a
slightly broken chord (i.e. where the keydowns are not precisely
simultaneous) I don't get the problem.

The problem occurs, as far as I can tell, with any VST plugin that produces a
sustained note (such as Synth1 or Phibes). However it does not occur with
unix-native softsynths such as zynaddsubfx or xsynth.

My midi controller is a DX7 and my soundcard is an Audigy2.

Is this an old and known problem or is it something particularly to do with my
(up-to-date Gentoo) system, or even with my hardware? Is there a solution?
Would jack_fst work better? (if I can ever get it to work at all).

Many thanks
Robert

-- 
Robert Persson
"No matter how much ye shake yer peg
The last wee drap rins doon yer leg."