The 252 Digital Reverberation System is the successor to the well-known 251 System. earlier models 250 and 251, this 252 system is supplied as a 19″ remote control rack. This IR set includes REV-D, NONLIN, REVERB and 250 VERB, all with 8 presets each. Then the REVERB and 250 VERB programs also have many reverb time settings from short (0.4 seconds) to long (4.5 seconds) with three different EQ settings (high, low, natural). CHORUS programs are not included.