If I load the Giga piano and 2 other instruments (piano, drums, and bass, 1 in each of three ports), then try to play from an external sequencer (a Mac running DP3), any long sustained notes on either piano or bass get cut off short, randomly. I have it set to 160 voices poly and 80 transition voices. My sound card is GSIF compatible (Echo Mia), CPU is 1.2 Ghz Athlon, 512 MB ram, Win98SE, 60 GB 7200 RPM ATA/100 (IBM) HD (2 30 GB partitions).