Megadrum Latency

[jman 31]

Megadrum hardware is just as good if not better than any MIDI device you can get - bar none.

Any computer hardware from the last 7 years that can play a DVD can monitor MIDI without a hitch. MIDI communication speed was based on the commonly available (cheap) watch crystal, and man, this is really slow, about 365 times slower than the first USB devices.

You have a problem with the consumer computer revolution - oh, then you must have a problem with latency too. But lets not assign these problems to MIDI!

[edit] I seems to have a bee in mi bonnet don't I luv...

and again....in English this time please!

[Ken Forgettable]

and again....in English this time please!

Sorry again jman. Can you agree with me that this has better MIDI latency than r0bbie's 2,6Ghz Pentium E5300 dual core 2,6Ghz with 4096Mb of RAM?

[r0bbie]

Update:
Changed MCU to Atmega644 @20Mhz.
Flashed latest firmware.
Polarity of snare piezo was reversed.
Set Global Latency and MinScan to lowest possible value.

Results:
Optimized firmware shows much better results, Megadrum latency is now consistent around 2Ms.
Setting the ImputPriority option to yes makes Megadrum about 1Ms Slower
Total system latency is now 14Ms, My next step is to optimize Windows Xp for further improvement.

2. It is possible to achieve under 5ms latency with a good sound card and proper ASIO drivers.

dmitri,
Do you know further specifications of the system this latency was achieved with?

Thanks,
Rob.

[dmitri]

Update:
Changed MCU to Atmega644 @20Mhz.
Flashed latest firmware.
Polarity of snare piezo was reversed.
Set Global Latency and MinScan to lowest possible value.

Be aware that setting them too low (to the minimum) can actually worsen latency and precision.

Results:
Optimized firmware shows much better results, Megadrum latency is now consistent around 2Ms.
Setting the ImputPriority option to yes makes Megadrum about 1Ms Slower
Total system latency is now 14Ms, My next step is to optimize Windows Xp for further improvement.

2. It is possible to achieve under 5ms latency with a good sound card and proper ASIO drivers.

dmitri,
Do you know further specifications of the system this latency was achieved with?

My 2 year old M-Aidio BlackBox claims to have under 5ms latency with 256 samples buffer.
I didn't measure it myself but certaily do not notice any delays.