PopTracker Integration & NWA Fixes

If you put your Poptracker installation under QUsb2Snes folder it will automatically scan available packs and you will be able to start them directly from QUsb2Snes PopTracker menu.

NWA support has been updated to use a new port range that fixes some weird issues. YOU NEED TO UPDATE your emulator with NWA support according to this. (their changelog/release note should mention the port change)