Fine tune Audio I/O Timing

[dado]

My are both on 0, must be different? Had some problem last time with the buffer on recording. Had too much latency too with the buffer on 16

[wvandyck]

Page 33 of the Digital Performer Getting Started guide available in the DP10 Help menu provides good information that maybe helpful to you.

More information about what you're doing may provide clues as to why you're experiencing latency when recording with the settings you've indicated.

[muxlow]

Resurrecting this thread instead of starting a new one...

I'm using DP, a Motu 24Ao, an analog mixer, and an ART Tubeopto 8 (8ch mic pre) to make a loop from DP out to a mixer and back into DP. Here's the chain:

DP --> Mac mini -- USB --> Motu 24Ao --> Analog mixer -- Main outs --> ART Tubeopto 8 -- ADAT --> Motu 24Ao (it allows ADAT signals to flow in as well as out) --> DP

I wanted to see how much latency the loop to the mixer is introducing, so I ran a click track out to the mixer and captured it back in DP on an audio track. The recorded audio was about 5 samples past the measure. So far so good, and I could stop there.

But I decided to try Fine Tune Audio I/O and things got WEIRD. Nudging the Recording by 10 samples as recommended by pg 35 of the Getting Started guide resulted in the audio coming back more than 1/2 a beat late. There were also some very weird drop outs and other oddities I never really grasped. The whole system just seemed to freak out a bit. Setting it back to zero put right back where I was (which is fine).

Even after R'ing TFM, I'm at a loss. Any idea what I'm doing wrong? The manual mentions MIDI and I'm just working with audio...is that the issue?

Thanks!

[Phil O]

Nudging the Recording by 10 samples as recommended by pg 35 of the Getting Started guide resulted in the audio coming back more than 1/2 a beat late.

I recall having similar issues a while back. I never got the adjustments to do what the numbers said. A sample was never the length of a sample. Ten samples was never 10 samples or even 10 times 1 sample. I finally gave up and set it back to zero. Is it broke or was I doing something wrong? I dont know.

Your friendly neighborhood Phil

[crduval]

I've spent a lot of time with these calibrations. Until I discovered them, I drove myself nuts sliding audio around to recover takes that were recorded right in the pocket but had shifted upon playback.

The audio recording latency calibration worked fine (where you loop back an audio sample and compensate), so my guitar and bass parts are now tight. I do seem to remember that this adjustment is dependent on buffer size, so I've sent my buffer once and haven't touched it since. I'm not sure if sample rate changes also require a recalibration.

But the playback latency calibration (associated with MIDI recording) doesn't work properly, if at all. No matter what corrections I make, this adjustment seems to be completely ineffective. It could be that my controller has too much jitter or something, although errors of 140-200 samples seems like a whole lot of jitter.

So I am still forced to manually edit MIDI recordings, which is painful since I record not only my keyboard parts, but also my drum parts live via MIDI. Rather than fixing just the obvious errors, I have to compensate for the general timing offsets, which change as the project grows in processing requirements. And I don't like quantizing, even playing with the strength and intensity features - it just never flows right for me.