Further problems! The DPCM channel can only address memory from the region 0xC000 - 0xFFFF, due to how its "address" byte is interpreted. Most cartridges cannot

Further problems! The DPCM channel can only address memory from the region 0xC000 - 0xFFFF, due to how its "address" byte is interpreted. Most cartridges cannot place RAM in this memory region, so you're stuck baking the samples into ROM space. Many cartridges cannot even bank switch this region, so the samples additionally cut into your "fixed" ROM that is usually precious space for interrupt service routines and common framework code.