Castline Gold 3.5mm TRS to 1/4 TS Mogami 2549 Stereo to Mono Summing Cable with Resistors
Hosa Technology Stereo Mini Male to 2 Mono 1/4" Male CMP-153 B&H
Amazon.com: SiYear 1/4" Stereo to Dual 1/4" Mono Insert Cable, 6.35mm (Quarter inch Female TRS to Dual 1/4 Inch Male Y Splitter Breakout Cable Patch Cord (50CM) : Electronics
Mono and Stereo (TRS) Cables - the Basics
Amazon.com: Legrand - C2G RCA Male to RCA Female Signal Splitter Cable, Black RCA to RCA Splitter, 6 Inch Audio Stereo Y-Cable, 26 AWG Audio Signal Converter Cable, 1 Count, C2G 03177 : Electronics
SUM-PSPP | Stereo to Mono Summing Cable 1/4" Male TRS to 1/4" Male TS
Amazon.com: tisino 1/4 Mono to 1/8 Stereo Cable, 3.5mm TRS Stereo to 1/4 inch TS Mono Interconnect Cable (Mono to Stereo Adapter) - 3 feet : Electronics