I have 2 modified Philips Music Modules. They have a switch to change the I/O ports between C0-C1 and C2-C3. They are also modified to be MSX-AUDIO compliant with 256kB sample RAM and the AUDIO BIOS (v1.3b). The BIOS correctly detects the chip on either I/O port setting and CALL AUDIO followed by PLAY #3,”ABCDEFG” works fine. VGMPLAY currently does not detect these modules when configured on C2-C3 I/O ports.