I've almost stopped using the metronome when recording MIDI. I record freely, and then use Set Measure/Beat At Now to align the timeline to the performance after the fact. At that point, I can quantize as needed and soften the tempo variations or completely remove them. If the piece is going to remain solo piano, I usually leave some or all of the natural tempo variation in place, and only completely "flatten" it if I'm going to record more parts, using the piano part (or sometimes a drum or bass riff) as the timing reference.
I can play pretty well to a metronome, but the tendency to alternately rush/drag to stay right on top of the downbeat can mess with "intra-measure" timing, and I'm more prone to suffer from red-light anxiety and have a big hiccup in the middle of a performance when using the 'nome.
When I
do use the metronome, it helps to have the click tempo really well-matched to the tempo at which I would naturally play without a click. For that, I use this technique:
- Disable Stop at Project End in Track View Options if it isn't already so the transport will run in an empty project.
- Start playback with no click sounding, count off a couple-few measures in your head, and stop the transport on the next downbeat.
- Shift+M to open Set Measure/Beat At Now, and enter that measure and beat.
- SONAR will set the tempo to make the specified beat fall on the absolute Now time where you stopped the transport.