From Sonnet Technologies:
Industry-first solution that fixes most audio and video playback problems which occur during playback of files from drives attached to an ATA host adapter installed in pre-G3 Power Macintosh and Macintosh clone computers. The Tempo AV Tool resolves playback issues by slowing down the data transfer from drives attached to the Tempo ATA100 to better match your legacy Macintosh bus and processing limitations. Compatible with Power Macintosh 7200, 7215, 7220, 7300, 7500, 7600, 8200, 8500, 8515, 8600, 9500, 9515, 9600; Workgroup Server 7250, 7350, 8550, 9650; Power Computing PowerCenter, PowerCenter Pro, PowerCurve, PowerTower, PowerTower Pro, PowerWave; UMAX J700, S900
Note: Not compatible with any other computer or ATA host adapter card.