Catastrophic crash when clearing signals

[k1o0]

A catastrophic crash occurs due to PsychPortAudio when clearing all variables from the workspace after running exp.SignalsExp. This error occurs when the same object has been run more than once. It may also occur when there is more than one experiment object in the workspace but I need to test this. The crash doesn't occur if the experiment object is explicitly deleted beforehand. This crash happens reliably and occurs after the cleanup method is run (i.e. not affected by the cleanup).

My feeling is that the audstream close function is not properly releasing the resources.