Do MIDI In jacks still use opto-isolator components? I think they did in the original spec... The rise- and fall-times could account for the added delay perhaps?
Larry Troxler wrote:
Well, I was going to actually cable this up, and then I realized that it's not so easy with the standard soundblaster MIDI adapter I'm using, since it doesn't provide female sockets, but instead, male cable ends. So in my case, I can't just take a MIDI cable and connect the input to the output!
So jmf3 and PT147, are you really talking about hardware MIDI, and if so, I take it you both have a MIDI interface card other than the soundblaster adaptor? If not, the how did you do it? Yes you can pass it through the Input and Through ports on a synth, but I think that first you would want to make sure that the "thru" port is really a hardware circuit connection, and not implemented in software in the synth.
If you _are_ really talking about MIDI, and not software emulation of it within the PC, then even so, 35 to 40 ms seems a bit long (these are ms values, right?).
PT147, you say that it's going to be more than 10. If this is milliseconds, I'm not so sure why that would be normal, because a complete MIDI message should go through the interface in about 1 ms. So any delay much greater than this should be due to the operating system and it's drivers. Am I missing something? Unoftunately, neither PT147 nor jmf3 said what OS they are running on. I have the feeling that this is where the problem lies. jmf3, what do you mean by "very high"?
Regards
Larry Troxler
On Wednesday 05 March 2003 21:29, PT147@mdx.ac.uk wrote:
I got between 35 and 40 ish. Surely it's going to be >10, anyway, because of the delay.
----- Original Message ----- From: "jfm3" jfm3@ouroboros-complex.org To: pd-list@iem.kug.ac.at Sent: Thursday, March 06, 2003 12:17 AM Subject: [PD] midi latency test
If you have some time, please connect your MIDI in to your MIDI out and bang on the attached patch. Let me know what number you get. I would expect this number to be very low; around 1. On my systems it is very high, and I'm not sure why.
-- (jfm3 2838 BCBA 93BA 3058 ED95 A42C 37DB 66D1 B43C 9FD0)
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