Mellotronists

Hi List:

Any M-Tron users out there?  Has anyone experienced this?  Any ideas?

I'm using M-Tron 4.5 as a VSTi with Cubase SX 1.0.6. and Windows XP, 
AMD Athlon XP 1.52 gHz processor and 512MB of RAM, with a Frontier 
Designs Wavecenter PCI soundcard.  I'm using Cubase as a virtual 
instrument host ONLY -- no tracks, no other plugins.

When I first open a project and start using a single instance of M-Tron 
the VST processor meter is showing about 20%.  As I play chords and 
notes over time the processor meter begins to rise.  It never 
decreases, only increases.  Eventually it reaches 80-90% and overloads. 
  The only way to clear the problem is to revert or close the project 
and reopen it.

Is there an update to fix this bug?  M-tron is unusable for me like 
this!  It happens every time I use it.  It usually takes 5 minutes or 
more, depending on how many notes I'm playing.  If I set up an 
arpreggiator to play continually I can get it to happen within minutes. 
  This problem only happens with M-Tron and does not occur with other VI 
plugins (Oddity, Arturia Moog, etc.)

Changing buffer settings has no effect on the problem.  I have tried 
everything from 64 to 512 buffer and the problem is the same.  A higher 
buffer setting might make it take a little longer before it builds up 
to 80-90% processor overload, but it still happens a short time after 
playing. The odd thing is that the processor meter never goes back 
down, even when I stop playing.  As I continue to play, it just keeps 
gradually getting higher, and the longer I keep playing M-Tron the more 
it keeps rising.  Also, if I hold notes, especially in the higher 
octaves, it seems to happen sooner.

Any help appreciated?  I sent this same message to GMedia, but so far 
no reply.  The only other thing I can think of is to try a different 
VSTi host, maybe V-stack (?)

Thanks,
Babz