The front panel allowed for more customization than any other tape echo on the market. You could control the repeat rate, intensity, and it had separate levels for echo and reverb so users could make their own unique combinations to suit their sound.
By paying close attention to your playing and constantly giving yourself feedback, you can focus in on the moments that give you the most trouble and work at those specifically. One additional way to give yourself feedback might be to record yourself. If I record myself playing my Errol Garner tune, I can even compare it to the original, and make notes about the spots where I’m not quite getting it right!