Best method for MIDI timing correction

Hi, I tried searching on this and was unsure which correction method to use.

I have bought an 80’s Roland synth, an MKS 80 and the round trip latency means that the audio is recorded a noticeable time late compared to the beat. I tried correcting using hitpoints and slicing but found errors and gaps in the sound. Is there a method to measure the time from the beat to the late note in the audio track? Otherwise I am guessing at a number for MIDI track delay.

thanks in anticipation