You need to set the Negative MIDI Playback Offset in the Preferences menu. Choose Setups>Preferences>MIDI. This capability is provided to compensate for the audio monitoring latency. If you are monitoring the output from your midi devices thru a mixer, there is no latencey. If however, you are monitoring the devices thru the Digi 001 the midi tracks will play slightly later that the audio tracks. The larger the setting for the Hardware Buffer size, the larger the latency. By configuring a Midi offset, you can get your Midi tracks to play back slightly earlier by a specified number of samples, thereby compensating for the latency in monitoring qudio within Pro Tools LE.Read pages 221-222 of the Pro Tools Reference Guide for detailed information on this process.