Bc2000 (for the BCF2000 & BCR2000)

To explain this question: for example, I have a hardware drum machine (Boss DR-880) which has great drum patterns and sequences built in, but I don't much like the inbuilt sounds, so I use a separate hardware sound module, connected via midi for the actual drum sounds. This gives a fairly unique sound which I'm very happy with. This works very well if I program full drum song performances into the DR-880, but it doesn't really lend itself very well real-time performance, since the DR-880 generally doesn't allow you to edit patterns while in play mode. I can switch drums patterns in real-time – which is great, but I would love to be able to select a drum pattern on the DR-880 and just let it run, then have the ability to mute any choice of drum `notes' in real-time somehow, eg. while the drum pattern is playing I'd like to mute several drum sounds such as the snare(note # 38), and open high-hat(note # 46), and later while still in real-time play mode, un-mute them one after the other in any order, and do the same for any notes within the midi stream.

Of course there are other drum machines, sequencers, devices, software, and ways to make electronic music to get around this issue - and I do some of those things at times – but I really want to know if this particular setup can do what I have described above with the bcr2000 used as the device in between the DR-880 drum machine and the sound module to filter out midi notes.

Following experimentation, I tend to think it isn't possible with the bcr2000, since in modes `S-1' to `S-3' the unit merges incoming midi notes with any performance data created in the bcr2000 – so it could only work if there is a way to add a message into the midi stream to `mute note x' until another `un-mute note x' message appears – even though `note x' midi messages are still coming in from the drum machine. I couldn't find any GM midi messages to do this. In mode `S-4' the bcr2000 generally sends only performance data created in the bcr2000 – so it could only work if there is a way to allow some of the midi transmission to pass from the midi IN on the bcr2000 to the midi out, i.e. the notes I want played – I couldn't get this to work either.

I'm fairly new to all of this so might have missed something. Anyway, so does anyone know if there is anything else I should try to get this to work with the bcr2000, or even is there a way to custom program the bcr2000 – I have a programming background so could do that myself?