el.samm~ and count~ go out of sync with max 5.1.3
I have a show tomorrow and I’ve just noticed a problem with a patch that used to work correctly (i upgraded max since then, and overlooked the problem in earlier tests of the patch).
I’m using el.samm~ and count~ together in a patch. With previous versions of max, these two would stay in sync as expected. With max 5.1.3 though, when i use the Core Audio driver for my EDIROL FA-66 soundcard, the sync between these objects drifts. Though if i use the Core Audio built-in driver for my macbook, they stay in sync as expected.
I need the two to stay in sync when using my Edirol soundcard. I’m running at 44100 sampling rate. Any help in solving this would be greatly appreciated.
Test patch is attached.
Once you use edge~ to move from the signal to the message domain, you are no longer assured sample-accurate performance. In that case the signal vector size could become a significant factor in the performance of your patch. Try a smaller vector size and you may get better performance. In general, when trying to debug a system involving several objects, you might want to test each individual object separately. Finally, in this patch you are using two separate metronomes and hoping for the best. You might try a redesign so that there is only one master clock in your patch. As a side note, this kind of problem is why I always try to keep timing in the signal domain.
Thanks for the comments. In the test patch the edge objects are there just to demonstrate the drifting. The problem isn’t that they aren’t lighting at exactly the same time, but that they’re flashing at entirely different rates (I may not have worded that very clearly earlier).
I agree completely that it’s best to stay as much as possible in the signal domain, your objects are really useful for that. Unfortunately in my case (at least i thought) it was necessary to use a count~ object as well as samm because i’m storing single sample ‘triggers’ in a buffer, and i need to be sure they get read out again, by feeding the buffer players (xplay) with a continuous sequence of whole sample index integers.
I reinstalled a previous version of max, and that didn’t solve the sync problem. So i’m wondering if it could be something to do with the general state of my OS. ugh!
Linking clicks to ramps has been on my todo list for awhile, but C74 has gotten there first with an elegant object called sync~. Maybe that could be the basis for redesigning your patch.
----------begin_max5_patcher---------- 850.3oc0XssbZCCD8Y3qPierCkQWrL39V+N5joiwVPTqsDikoARlv2dsjr4R BHLFLAdQFKDKm8rmcWI8V+ddSjKYJOvO.+Bzq2a860yLkdhdUu2yKKZYbZjx rLuWh9GapLOas2.62NOpH9YtX1uyYwEVKgnCgC.gP8HlFneD3ODBdp5mvSLl RN4Oe2On1NErkEwxTYt0FaVrXQFWjxJL+8zsSJWTTOaP0rSVLcJKWDkwL1OV irZyaWdwp4Lq88llJiJ7F37Cobk4oG3IsUduee8vfqNUYGOEUQ6NpRwEruPl JVlkwDE65el4wCAwRwTddFXdZzpIQw+sdMSkhBE+UCFQ3Rd6nTrUGR7sLMx2 P0vivw9dGhKQ67mtgy9YNOJ06frL7JxAng.PoyHyS.kQoEJYIbOaNfPLjPfY DACcxA3uLNPvdoDAehBJEYIShDyNe+1er0iIzst+Q8a3UwuQGKMx3AsJ8nPN aVJyQUDLZWMN1oaRBc5lMzY3kJ0V4KGIDaU3qA6Uyt4wYruk.FYHfwNywIiN HAPtVwYEeln7GcMYGa05J1A3CgvVmJfwU0AcKRnWkbA7Iaoz9jhiPUbQBa4Z vtMzNeYjMOZD1IEc3VE36AYzIKXPfv8KH5vOI2y0KZWbtx8qZKLZjS+G8vUt HdUbJaM.258IX2xDk5jWf2u5+LlREMi8IhQSBbgJJatprPHj19xnnfpxnDyi wGlivgcKG0IMYZWJUMuDZSoHtjN3QOpcW9151papasXq7PctCbL8wK0Zx7rR F.Nr0EiqaIgblPQdfRnTqDwqasRAaK+5G3RoftNYRjSnTzGrevEzDm8ZRTrq qAodyois97lwC4yicJA5rCgxRGV13HasVkCPsOrZ2+cn6vJsaOJZWT.PNmIZ +oRrhcJzUxO5ll7aPfWZYyvOb+nFuPO+9jjRtHOt1T0AQvVGIgoJ3hnBtTr6 hFs2hdlmjvLeeMmkwSlKKS7T0202ACYMES5633jXRuqkaHlHgM.Sjyjmvnvg T8EBPzOv9ae6RQqeGf1KDS3lnz9.v67nZSTZ5yVcKwD49CS3ln9w2V8zGJJc DLQu8XBcJLQ1aQmtJQf8bJiM2..ghLEKzuconsIJswW.AV9x68+OhsRaIB -----------end_max5_patcher-----------
Thanks Eric, that patch is helpful.
Do you know whether reading a buffer index based on a sync-ramp * buffer-length-in-samples, is an approach that can be relied upon to safely read every sample in the buffer without skipping any? (assuming the buffer was recorded into at the sampling rate).
I avoided doing this initially because i though there might be subtle problems with rounding leading to skipped samples. But if this works then i think it would solve my problems.
Forums > MaxMSP