Psytrance or Psychedelic trance has a distinctive, speedy sound (generally between 140 and 150 BPM) that tends to be faster than other forms of trance or techno music. Psychedelic trance uses prominent bass beats that pound constantly throughout the song, and overlays the bass with varying rhythms drawn from funk music, techno, EBM, Middle Eastern music, and trance using drums and other synthesized instruments. The different leads, rhythms and beats generally change every 32 beats. Layering is used to great effect in psychedelic trance, with new musical ideas being added at regular intervals, often every 4 to 8 bars. New layers will continue to be added until a climax is reached, and then the song will break down and start a new rhythmic pattern over the constant bass line. Psychedelic trance tracks tend to be 6–10 minutes long. Psychedelic trance also makes heavy use of the cutoff frequency control of the modulating filter on the synthesizer. Reverb is also used heavily, with large, open sounding reverb present on most of the lead synthesizers in the track.