If your cache limit is set to 32 MB, it can contain 128 elements, each at a max of 256 KB. If you are playing 32 sounds at the same time, you still have 96 additional chunks of audio you can keep in the cache to avoid latency. If your limit is 48 MB, you have room for 192 elements, so even if you play 32 sounds concurrently, you can keep 160 chunks primed.