Pro Tools|HD systems support full 24-bit audio input and output signal paths, with 48-bit internal mixing and processing, providing an additional 16 bits of headroom at the top of a channel’s dynamic range, and 8 bits at the bottom. You can exchange files with other 24-bit recording systems without any bit-depth conversion (as long as they are in a compatible file format).All other Pro Tools systems support 24-bit input and output, and uses 32-bit floating point mixing and processing internally. You can exchange files with other 24-bit recording systems without any bit-depth conversion (as long as they are in a compatible file format).