The preferred way to submit bug reports and feature requests is via Github here: https://github.com/izzyreal/mpc/issues
If you don't have an account there and don't want to create one, you can send a report to the below email address.
Your bug report should contain the following information
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Operating system: Windows 32 bit/Windows 64 bit/MacOS/Linux/etc.
VMPC2000XL version: Can be found in top-right of the user interface and in /Users/you/Documents/VMPC2000XL/vmpc.log
Steps to reproduce:
1. Write very
2. detailed steps
3. how to reproduce the issue
4. For example
5. Start VMPC2000XL and go to LOAD screen
6. Load a sound
7. Press Ctrl + ESC and the app crashes
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There's a log file in /Users/you/Documents/VMPC2000XL/vmpc.log that you can attach to your email.
Screenshots or videos are helpful in some cases, but the most important part of your report is the "Steps to reproduce"!