Midi over usb note lag bug

[dillan.k]

I've tried a few things over the past few days and the problem has seemed to have been reduced to exactly how zenoise describes it. Sometimes the lag is there, probably about 1 in 10 times. As long as I turn off megadrum and restart my computer the lag is not present and I can play. One time I think I left the megadrum on overnight after using it, then turned my computer on and the lag was already there. What I first did was use a shorter USB cable about 1.5m (from 3m) then updated to the latest firmware and then set it up. Now I am back to using the longer cable, its still the same. Unlike before I can now make changes to the settings and save etc without it producing the problem . It feels like its definitely something to do with the USB interface. I read up on the noteon/notoff thread about the startup timing of the PIC, could it be something to do with that? Sorry I'm not completely familiarized with the electrical detail of the Megadrum, and I'm not trying to assume anything until its comfirmed.

At this stage I wont worry about sending it back. Before I couldnt play at all but now I can at least get the drums working most of the time, now I can understand why zenoise said it didnt bother him. Idealy I would probably use megadrum with the midi interface, it seems to carry a lot less problems.

[dmitri]

I read up on the noteon/notoff thread about the startup timing of the PIC, could it be something to do with that?

It most likely is. Writing latest PIC USB firmware will eliminate the problem completely from the PIC's end.

[r0bbie]

Hello all,
I have had the same problem, as a low latency junk I am I was tempted to flash my pic with latest firmware to reduce midi latencyl, I also had this one note behind lag phenomenon and decided to back to my old midi settings.
In previous lessons I have already learned that midi over usb is not reliable, if the fridge switches on in the middle of my personal best drum session the connection is lost and needs to be re-establisched with a few mouse clicks, killing for creativity.
My conclusion is to use a good quality old fasion midi interface and forget about midi over usb, it will bring instability and frustration.
My real life system latency ( that is hitting the piezo ---> sound comming from the speakers) is now <=9 Ms, and thats with an obsolete mpu-401 compatible midi interface.

Just my 2 cents

Regards!
Rob