Here's a tip for Delay Control that has helped me. If you are presented with 2 close options for a tight delay, let's say 1 millisec and 10 millisecs, listen for artifacts like phasing when turning on and off the delay. If the sound gets thinner when the delay is active, it is phasing, and chances are a delay between 1-2 millisecs is being used. Also keep in mind that it is almost impossible to hear a delay under 30 milliseconds (give or take depending on the invidual and the sound source) due to the HASS effect. If you don't hear a delay at all, it's probably under 30 milliseconds.