Hello!
I would like to send different sounds to different speakers. Is it possible to play different sounds from different speakers through monkeylogic with one sound card that is embedded in the desktop? If not, how many sound cards will I need: one for every speaker?
Thank you!

You can play different sounds from different speakers. You need only one sound card.

The number of speakers you can add is dependent on the sound card. If your card supports 5.1 channels, then you can add up to 6 speakers and, if it is a 7.1 channel one, up to 8.

To send different sounds, just fill each channel with different sounds. For example, the following code will play a noise only from the left speaker.

fs = 48000;
y = rand(fs,2);
y(:,2) = 0;   % y(:,1) = 0, to play from the right speaker
sound(y,fs);  % This is for demonstration. Do not use this function in your script.

Thank you for your reply! This is extremely helpful!!

Hi,
Is it possible to do this for sounds that are defined as task objects as well?
What I mean is that in the task object - snd(https://monkeylogic.nimh.nih.gov/docs_TaskObjects.html), is there a way to specify the speaker also? It seems like this is not possible. Then what are the alternatives?
Thank you

You do not specify a single speaker. Look at the above example carefully. You use all speakers at the same time and play silence in all the channels but one.

Mapping sound channels to speakers has nothing to do with NIMH ML. It is what you should do in the control panel or with the sound card manufacturer's software.