# AAX setLatencySamples not working **URL:** \ **Category:** Audio Plugins\ **Created:** [April 30, 2015, 11:17am UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714 "2015-04-30T11:17:04Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![chkn](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/chkn/32/3862_2.png) [@chkn](https://forum.juce.com/u/chkn)\ **Post date:** [April 30, 2015, 11:17am UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/1 "2015-04-30T11:17:04Z")
It seems ProTools just ignoring the latency changes ( even after starting/stopping the transport source) Checked with ProTools 11 on Mac ---
**Author:** ![fr810](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/fr810/32/841_2.png) [@fr810](https://forum.juce.com/u/fr810)\ **Post date:** [April 30, 2015, 12:18pm UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/2 "2015-04-30T12:18:00Z")
When are you changing the latency? Looking at juce's AAX wrapper, SetSignalLatency is only called on initialization or when the bufferSize or sampleRate changes (i.e. right after a prepareToPlay call). ---
**Author:** ![chkn](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/chkn/32/3862_2.png) [@chkn](https://forum.juce.com/u/chkn)\ **Post date:** [April 30, 2015, 12:41pm UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/3 "2015-04-30T12:41:55Z")
AudioProcessor::setLatencySamples allows to change the delay compensation of the Host (if a plugin introduces latency), it triggers the AudioProcessorListener, which is connected to the wrapper, which calls the plugin-format specific method to change the latency.   ---
**Author:** ![chkn](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/chkn/32/3862_2.png) [@chkn](https://forum.juce.com/u/chkn)\ **Post date:** [April 30, 2015, 1:21pm UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/4 "2015-04-30T13:21:23Z")
If you have an Avid Developer Account, please have a look here https://developer.digidesign.com/phpbb/viewtopic.php?f=95&t=1398   ---
**Author:** ![chkn](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/chkn/32/3862_2.png) [@chkn](https://forum.juce.com/u/chkn)\ **Post date:** [April 30, 2015, 1:37pm UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/5 "2015-04-30T13:37:00Z")
update, its working with the windows build of my plugin, but not with the mac version ---
**Author:** ![fr810](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/fr810/32/841_2.png) [@fr810](https://forum.juce.com/u/fr810)\ **Post date:** [April 30, 2015, 1:42pm UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/6 "2015-04-30T13:42:15Z")
Sorry I should have been more specific: AAX plug-ins report their latency to ProTools via the AAX controller's SetSignalLatency call. You report your plug-ins latency to JUCE via the AudioProcessor's setLatencySamples call. The way the AAX wrapper is written, the latency is only passed on to the DAW immedietely after a prepareToPlay call. In essence, your latency will only come into effect after JUCE calls your plug-ins prepareToPlay call which, in turn, is called when the sampleRate or sample buffer size changes or on plug-in initialization. Callng setLatencySamples outside of this function will not have an immediate effect. Therefore, my question was about when you call the AudioProcessor's setLatencySamples. Sorry for the confusion. ---
**Author:** ![chkn](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/chkn/32/3862_2.png) [@chkn](https://forum.juce.com/u/chkn)\ **Post date:** [April 30, 2015, 2:20pm UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/7 "2015-04-30T14:20:33Z")
okay my fault! Delay Compensation wasn't turned on in ProTools! ---
**Author:** ![chkn](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/chkn/32/3862_2.png) [@chkn](https://forum.juce.com/u/chkn)\ **Post date:** [April 30, 2015, 2:23pm UTC](https://forum.juce.com/t/aax-setlatencysamples-not-working/14714/8 "2015-04-30T14:23:14Z")
\> Callng setLatencySamples outside of this function will not have an immediate effect. Therefore, my question was about when you call the AudioProcessor's setLatencySamples Thats not right, you can call it every time and it works (if you turn delay compensation on ;-) Sorry for wasting your time!!!