 Wavetable daughterboards that were later available provided audio samples that could be used in place of the FM sound.These were expensive, but often used the sounds from respected MIDI instruments such as the E-mu Proteus.The computer industry moved in the mid-1990s toward wavetable-based soundcards with 16-bit playback, but standardized on a 2MB ROM, a space too small in which to fit good-quality samples of 128 instruments plus drum kits.