Gator GA-100 Caster Kit leem The CBF-1SP by Zoom is

The CBF-1SP by Zoom is a padded-shell case that protects your F1 Field Recorder from shock and scratches

complex modulation from multiple CV sources

and better amplifier compatibility because the circuit functions as an almost entirely restive load

So you can get a mix of all four channels out of the CH4 VCA output (unless you patch a VCA output from an earlier channel)

and shuffle to create a wide range of modulation patterns

Gator GA-100 Caster Kit leem The CBF-1SP by Zoom isCaster Kit for Gator Standard Racks Features High Density 3 4" Industrial Plywood Held in Place Using 2 Locking Straps Supports up to 400 pounds 4" industrial casters Fits standard racks