JOYO JF-318 Quattro Digital Delay, aka The Quattro, like the name suggests, is a four mode delay: COPY / ANALOG / MODULATION / FILTERED. The maximum delay achieved is an impressive 958,3 MS ! COPY is the standard digital delay sound, where the echo sounds as close to the original as possible. ANALOG sounds like the classic BBD effect, as found on other JOYO delay pedals. MODULATION adds a Chorus effect to your delays and makes them wider and deeper. FILTERED mode send your guitar through an adjustable Mid-Frequency filter before it gets delayed. This mode presents many interesting possibilities and you just won't believe it is all coming out of a tiny little pedal.