Check your sound module's receive channel - is it set to receive on multi channels. Is your Midi Out from the Compaq connected to the Midi In of the module!!! Are the modules' omni/poly settings correct.
Try using another module instead ... maybe the module's Midi In connector has 'kicked the bucket'. Another option could be to check your games port to Midi connector. Some of these leads have two midi ins and outs - did you connect the right ones.
Hope that helps some.
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Vim