It could be due to several things:

In Options > MIDI/Audio Drivers setup, check the Latency value.

From the help:
"Software synthesizers have some inherent latency, which is the delay between the time a note is played and it is processed by the computer. Older softsynths had noticeable latency, whereas a VSTi/DXi synth using ASIO drivers has very little. This setting is used to synchronize the visual display (notation, chords, virtual piano etc.) with the sound you hear.

Band-in-a-Box automatically sets the latency for VSTi/DXi and some other softsynths.

The [Latency Adjust…] button in the MIDI/Audio Drivers Setup dialog opens the SoftSynth Latency Adjust dialog where you can manually adjust the latency."

There's a video that might help, here:


Search help for 'Quantize', also.

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