Holiday notice: Cycling '74 will be closed Monday, October 9th. Manual authorization, support cases, and manual order processing will be delayed.
two sfplay~ loop 1 phasing??
Jan 22 2013 | 5:52 pm
Hello,
I have a Cubase project which is in 2/4 at 100 bpm.
I export two click track loops: one is 1 measure long, i.e. 1200 ms, and the other is 8 measures long, i.e. 9600 ms.
I open these two stereo 44100Hz 16 bits wav files in two sfplay~ and sfinfo~.
sfinfo~ tells me the first one is 1200 ms long and the second is 9600 ms long.
When I send a signal 1 in both sfplay~, both loops begin playing together.
But after 5 minutes they get out of sync...
How is it possible? Am I becoming crazy?
I have a MacBook Pro 2.3 GHz Intel Core i7, 8 GB 1333 MHz DDR3 running Mac OSX 10.7.5 and Max 6.0.7
I have an I/O and signal vector size of 128, sampling rate is 44100Hz, scheduler is in overdrive, in Audio Interrupt off, and vector optimization on.
Thanks for your help, I really don't understand this.
- Jan 22 2013 | 6:37 pmI'm not sure whether sfplay~'s looping is sample accurate or not. You could test this by creating a 2 sample long file in audacity with two different values and seeing what happens when you loop it.If you want sample accurate looping, I'd recommend the buffer~ based playback objects, as I know for sure that those can do it. (groove~, rate~ and wave~ should get you there)
- Jan 22 2013 | 6:45 pmI have 25 loops to play at the same time, if I use buffer~ I wonder if it's not gonna too much for my memory
- Jan 22 2013 | 6:59 pmOK it's good to know: sfplay~ is not sample accurate and is not good to deal with loops and regular tempos. better using buffer~ I wish somebody told me this months ago...
- Jan 22 2013 | 7:13 pm10 megs for 1 minute of 16-bit stereo audio; chances are you'll be just fine on RAM, unless your files are gigantic.
- Jan 22 2013 | 8:08 pmIs there a way to monitor the RAM? I know there is the DSP CPU Monitor, but is there an equivalent for the RAM?
- Jan 23 2013 | 12:50 ami did this waaay back with the help of the shell external. so get the shell external and try this:hope it helps (tested with max 5.19 on mac osx 10.8.2) hans
- Jan 23 2013 | 3:28 amThanks. I've ended up with the buffer~ and groove~ solution. Much more accurate. I have no idea what is the shell external but thanks anyways.
