“The Ibanez CSL Stereo Chorus is part of the Ibanez “L” series or the
“Master” series. This series followed the well known Ibanez “9” series
of effects. Only made for one year, the CSL is nearly identical to the
Ibanez CS9. It contains the same circuit [does it?] of the CS9
consisting of the Panasonic BBD MN3207 and MN3102 chips along with two
JRC4558D and one JRC 1458D for exceptional warm analog chorusing.”
More information here.