OPLx , Thanks for your reply. The midibox diagram will be very helpful for me. The code of dosbox OPL and the 2 other emulators does not indicate that the feedback is used. Very strange thing. Tom Tom does't use feedback (IMO next wasted potential, Yamaha could implement it as single additive …

Multipliers? DOSBox is doing bitwise operations here. Yes, multipliers. Multiplier for Phase Generator for operator 13 and 16 is stored in bits 0-3 of registers 0x31 and 0x34. Correct way is doing bitwise operation from operator 13 [slot 7 operator 0/modulater] or operator 16 [slot 7 operator 1/ …

I found differences in many emulators of OPL2/OPL3 drums. //Snare Drum Bit32u sdVol = Op(3)->ForwardVolume(); // it is operator 16 if ( !ENV_SILENT( sdVol ) ) { Bit32u sdIndex = ( 0x100 + (c2 & 0x100) ) ^ ( noiseBit << 8 ); sample += Op(3)->GetWave( sdIndex, sdVol ); // it is also operator 16 } /* …

I found bugs in my implementation of TC, HH and SD (I compared with the results of DOSBOX OPL3 emulator). Can anyone please record samples (in WAV or other PCM format) from REAL OPL2 or OPL3 from attached test file ? I want to know they are my bugs or bugs of DOSBOX. Test file is composed in Adlib …

I am looking for a DOS (working in dosbox) application to test my enhanced implementation of OPL2. I need to check (and probaby correct) Bass Drum, Snare Drum, Tom Tom, Top Cymbal and High hats. For melodic channels I have used FOLK102 application and HSC Tracker (this tracker has one-semitone bug). …