PC software-generated multitimbral music and sound effects through the AdLib card, although the acoustic quality was distinctly synthesized. Digital audio (PCM) was not supported; this would become a key missing feature when the competitor Creative Labs implemented it in their Sound Blaster cards. It was still possible, however, to output PCM sound with software by modulating the playback volume at an audio rate, as was done, for example, in the MicroProse game F-15 Strike Eagle II[5] and the multi-channel music editor Sound Club for MS-DOS.[6]