Electronics > Projects, Designs, and Technical Stuff

Where to buy Musical Keyboards

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Renate:
I don't know why everybody is getting all worked up about latency and how problematic USB is.
Most sounds that you generate have an attack profile anyway.
Are you considering that as latency?
Maybe we should make a non-causal MIDI system that starts the waveform before you press a key.

Just move your head closer to the speaker, you'll knock off a millisecond latency for every foot!

Ok, I'll measure up some actual keydown to start of waveform using separate USB MIDI devices on a host.

MarkMLl:
@Renate: you're the first person who's said anything about latency. The issue I highlighted was the fact that if you want to build a USB master you're pretty much constrained to having a full-blown OS etc. in there.

MarkMLl

Renate:
There's been a few comments about making things low latency.

In any case: I put a piezo xtal on top of a crappy USB MIDI keyboard.
From the keyboard, through Windows 10, to a USB MIDI synthesizer, to the 2nd scope channel.
The latency runs 7-9 mS.

Running without the keyboard, I can directly output notes in Windows 10 at 2500/second.
(That's actually about the rate that I play piano.)

MarkMLl:
(Looks back) OK, I see one comment about latency which you pounced on and amplified. I'd be inclined to agree with you, but I'd point out that it was apparently the spur to fixing quite a lot of responsiveness problems in the Linux kernel... and I presume that the people who invested time in that had good reason to do so (and were able to make a good argument for their fixes being accepted by Torvalds).

I suspect that it's not so much latency of one channel in isolation, but the sort of problems that you can get if multiple channels get very slightly out of sync: the human ear is very good at picking up discontinuities.

MarkMLl

Jan Audio:
Big things are hard to find in china because its not cheap to ship.

You could buy a casio keyboard somewhere and take out the circuit, it is complete circuit only for the keyboard.
It will be cheaper then buying all the keys.

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