Read pointer to filename currently playing

=> | R0 = 2
| (R1 is not required for this reason code)

<= | R1 = | pointer to zero-terminated filename (0 if not open)

If a sample is currently open then this returns a pointer to the filename used to open it (which will be exactly as passed to PlayIt when opened). As the pointer points into PlayIt's workspace the string at that pointer must not be modified.

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