Boost D.L.A. has a single continuously variable Time control for up 1,000Ms (or 1 second) of delay time--you will time the delay easily to your song's tempo with this single control. Both pedals have a Wet/Dry Mix control plus a Tone control to roll off any scratchy high frequencies. D.L.A. also has a Flutter control that adds a slight chorus modulation to the delay to imitate the sound of old analog tape based units (Echoplex) or one of those quirky, electrostatic (oil) drum delay contraptions. The sound of Boost R.V.B. fits right in with first generation digital units, analog and charge-coupled 'bucket brigade' reverbs. Reverb styles such as spring, plates and natural ambiences are all covered here and the Rumble control removes any amount of low frequency noise from the reverb.