In the Quantize window, you want the following: What to Quantize: Attacks: [checked] Releases: [not checked] Don't Change Note Durations: [checked] with these options selected, you will only be quantizing the attack of each note, and not the length. The reason why your drum tracks weren't affected is that drum samples are very short transient sounds that don't sustain, so you don't notice if quantizing chops the endings or not, as long as there is some sort of attack present, the sound will play. Try those settings, they should give you what you are looking for. - Slim