The RC-505mkII looks a lot like the original desktop looper that conquered every beatboxer's table, but under the faders it's a different machine. Here's what actually matters about the mkII once it's on your desk, and the settings worth finding in week one.
The 32-bit engine changes the workflow
The headline upgrade is the same one across the current BOSS looper range: a 32-bit sound engine with unlimited, uncompressed overdubs. On the original 505 you thought twice before stacking another layer; on the mkII you simply don't: five stereo tracks, as many layers as the performance needs, no degradation.
Effects got serious
The mkII carries a far deeper effects section than the original, split between input effects (processing what goes in: harmonies, vocoder, pitch) and track effects (processing loops already recorded: filters, slicers, beat repeat). Effects live in four switchable banks, so a single performance can move through wildly different sonic territory. Dig into the effects mode settings early: like the RC-600, some of the power is switched off by default.
Assignments are the real superpower
The mkII's assign system lets you map internal parameters and external controllers to almost anything. The four knobs above the faders are fully assignable per patch, and external footswitches or MIDI controllers extend it further. The moment your hands are busy performing, a well-planned assign map is what keeps the show moving. Plan patches per song, exactly as you would set-list presets on a floor unit.
Tip: Treat each of the 99 memory patches as a song, not a scratchpad. Saved fader positions, effects and assigns per patch is the difference between a demo and a set.
It's a proper audio interface too
Like its floorboard siblings, the mkII does double duty as a USB audio interface: loop performances straight into your DAW, resample from the computer, or record practice sessions without extra hardware.
Watch the full breakdown
In the video above I run through fourteen specific mkII features, including the ones BOSS doesn't advertise, with the exact menu paths for each. If you're deciding between keeping the original 505 or upgrading, watch that first; if you've already upgraded, the full course below covers every setting on the unit, step by step.