Malloc/free issues

[J-M-L]

I don’t know the platform in details - but source code is available

libraries/Portenta_SDRAM/src/SDRAM.cpp

The GIGA R1 has 1 MB of SRAM that is internal to the processor, and 8MB of SDRAM.

I would assume that if you don’t call begin() you end up playing only within the 1MB space.