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I’m getting some weird artifacts when trying to use sends in FMOD Studio. If I add a send to any track of an event, even without any affects to that send I get a kind of phase shift sound as I increase the signal to the send. To test whether or not there was something weird with my signal chain, I created a new event and tried with just the default Reverb send. If I bypass the Reverb effect or bring up the dry level in the effect, I get the same phased audio. If I enable the reverb but keep the dry signal at 0, it sounds fine. Any ideas why this would happen? I got the same behavior using FMOD 1.07 and 1.08. I’m on OSX 10.10.

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Sends introduce a small amount of latency. (This feature is necessary in order to support certain types of routing, such as circular routing.) Because of this latency, playing a sent signal alongside the original signal at close to the same volume can result in audible phasing.

There’s a number of ways to avoid this phasing. One of the easiest to implement consists of having the same number of sends in each ‘branch’ of the signal path; The amount of latency introduced by a send is fixed, so as long as your ‘dry’ signal goes through as many sends as your ‘wet,’ there will be no audible phasing. (You will, of course, need to set the volume of whichever audio track or bus holds the new ‘dry’ send to -oo, and the send will have to be positioned pre-fader.)

  • just a guy

    Thanks for that info.

  • just a guy

    Hi Joseph,

    Can you tell me about other solutions to this issue that you know of? If I have to use prefader sends and set volumes to 0, then I can’t use bus groups in the mixer.

    Thanks.

  • Joseph Harvey

    This solution does not prevent you from using bus groups in the mixer. Return tracks inside an event can be routed to the master track of that event, and so do not prevent the event from producing output; And return buses in the mixer can be routed into group buses without a problem.

  • just a guy

    Cool, I’ll read up on routing a bit more as I’ve clearly misunderstood things a bit. Thanks.

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