A "COM read time out" sounds like the host computer failing to get some input from the VCI. There are a bunch of settings for flow control on the serial input ports on the PC side that might solve that problem:
Control Panel/System/Ports(Com&LPT)/Com3 right click, select "Properties"/Port Settings/Flow Control
What do you think Midifidler? A com port issue? I'm handwaving here.
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