Below is the list of available Multi-Effects in the TD-50:
DELAY
TAPE ECHO
REVERSE DELAY
3 TAP PAN DELAY (Panning Delay)
OD > DELAY (Overdrive and Delay)
DS > DELAY (Distortion and Delay)
CHORUS
SPACE-D (Two-Phase Chorus/Modulation)
OD > CHORUS (Overdrive and Chorus)
DS > CHORUS (Distortion and Chorus)
PHASER A (Phaser effect)
PHASER B (Modified Phaser)
STEP PHASER (Gradually Varied Phaser)
FLANGER (Stereo Flanger)
REVERB
LONG REVERB
SUPER FILTER (Frequency Filter with Sharp Slope)
FILTER + DRIVE (Filter effect with Overdrive)
AUTO WAH
OD/DS - TWAH (Touch Wah with Overdrive)
LOFI COMPRESS ( Lo Fi Compressor effect)
DISTORTION
OVERDRIVE
SATURATOR (Distorted Compressed sound)
T-SCREAM (Modeled classic Overdrive)
BIT CRUSHER (Low Quality Audio effect)
ISOLATOR (Isolated EQ effect)
RING MODULATOR (Bell sounding effect)
PITCH SHIFTER
AUTO PAN (Automated Panning effect)
For more details about the MFX and other parameters in the TD-50, download the TD-50 Data List. For MIDI information related to the MFX, please refer to the TD-50 MIDI Implementation: https://www.roland.com/global/products/td-50/support/