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Thank you for your reply. I will be using my midi keyboard with this hardware, so i will try to compenzate this bug. However, I have an option to try MIDI with Presonus Firepod. I will mention just in case: I am talking abou errors in sending four controlers data (4x3bytes) in a row. First 3 bytes are allways ok, others are sometimes facing some problems.

I am sending MIDI commands with PIC18f4620 to M-audio firewire audiophile audio card. I have noticed a strange bug. If I am sending the same commands in the row to close together (no larger time pauses between chunks), there is data corruption. I have pluged my home-made MIDI out into home made MIDI in tester and everything works fine. However, not with audio card mentioned above. If I put 5ms delay between 3 byte MIDI chunks, everything works fine. But this produces some latency... Are pauses between MIDI messages part of MIDI specifications or is there a problem with my MIDI receiver on audio card? Thank you for your replies.

Thank you for your reply. I haven't solved the problem because I have put off it for a while :) I am finishing the midi controller part at the moment (It uses Crumar Performer keyboard, touch pads from broken laptop computers and a touchscreen) However, I would be glad if you would give me some additional hints about the gate triggering. I have looked at the code you linked but it is complicated indeed. If it will be necesary to go trough it, I will take a chance. Regards, Ziga.

Hi. I have been inspired by ucapps to use SID in my home-made keyboard project. However, I am that kind of person, that tries to build it's own design. I have obtained the MOS 6581 datasheet but I am facing with some problems playing sounds. There are some pops sometimes and also strange problems with only voice2 working (tests on C64 shows that SID is in perfect condition). I have two main questions: 1. Is this SID driver sequence OK: note on: attack/decay=0, sustain/release=0, voice&gate=0, frequency set, attack/decay set, sustain/release set, voice set with gate=1; note off: just gate=0 (voice shape remains untached) 2. In wich file is the program code with communication between PIC and SID that is used in midibox projects? I would like to compare it with my code. I am using CCS C-compiler and 16f877a. Thank you for your responce.