posted 06 September 2009 13:49            

I have two problems at the moment.
The first is the latency in my Pacarana set-up. I am currently set up like this.
Ableton Live using my Digi 003 rack --> ADAT --> Konnekt 24D ---> Pacarana and back again. Macbook Pro FW800 --> Pacarana.

So far this set up has been working great as I have been learning Kyma, but as I am now integrating Kyma into compositions I have just started to notice the horrible latency in my system. In Ableton I have to compensate up to 72ms which is far from ideal and from what I gather, not to be expected.
Is there anything obvious wrong in my chain which might be causing this? Possibly an error in the setup of the Konnekt drivers?

My second problem is that since starting to use multiple I/O with the Pacarana, the clock ( set to sync via ADAT via Konnekt 24D -- a slave to the 003 Rack via optical ) is starting to go crazy with a huge amount of pops and clicks. Previously having used just one stereo channel for I/O I never experienced this problem. At the moment I am at a loss of why this would only be a problem running when using more than one stereo channel of I/O.

posted 06 September 2009 14:16            

Yes, 72 ms sounds unexpectedly large. What sample rate are you using? (and which version of Kyma)? What kinds of Kyma processing are you doing (for example, analysis/resynthesis and cross filter have some delay intentionally built into the algorithms themselves).

Each element in the chain has a buffer that adds to the delay. So Ableton Live has an input and an output buffer (or system block size), the Digi 003 ADAT has an input and an output buffer, the Konnekt 24D has an input and an output buffer, and the Pacarana has an input and an output buffer. The sum of these buffer sizers divided by the sample rate gives the roundtrip delay through the whole system. So higher sample rates may give you shorter delays.

Regarding the clicks and pops for multichannel, could you try using the headphone jack on the Konnekt to monitor the input on each channel to hear whether the clicks are already in the signal before they go through the Konnekt?

posted 09 September 2009 16:31            

Thanks for the reply. The sounds I were using were basic; delays, small reverbs etc, so nothing DSP intensive. Running at 44.1 / 24 bit . I suspect its due to my current setup.

Im afraid im in the middle of moving, to start studying at the Liverpool Institute of Performing Arts so I will not be able to look into this problem in the next week. However I will try out the suggestions you put forward as soon as I can and get back both to you and Bar None.

Regards,