I was doing a simple recording of an idea for a bass line, which consisted of pumping 8th notes at 140BPM. I noticed that my timing was occasionally a little off on the odd note. The worrying thing was I couldn't hear it at the time, it was only when I played the recording back that I noticed. I tried recording the line with one finger rather than alternating. and it was much better - attack of the note was way more consistent, but the timing was also better too. I don't think the problem is my own internal timing, probably more my right hand technique.
This is something that I would like to improve, and I can do metronome exercises etc. but given that I couldn't hear that I was not in time, makes me a little confused on how to improve. I could almost do with an app that lets me know how close to the beat I am when playing. Does anyone know of a tool that I can use to check my timing?