The Boss RC-30, and other pedals like it, allows musicians to record small segments of music on multiple tracks and layer them to individually create songs or add color to a band’s performance.
This Boss pedal has two synchronized stereo tracks, three hours of recording time, 99 onboard memory presets, a rhythm guide with a selection of real drums beats, whose tempos and time signatures can be adjusted. It has multiple jacks for instruments and microphones, and a USB jack for both importing and exporting WAV files from a computer.
There are tons of demo videos online, both professional and user-generated. BOSS also hosts the Loop Station World Championships every year with many video performances online. This one, from Dub FX, is one of the most direct and succinct when it comes to showing how the loops are layered to produce songs. He hosts a number of NAMM (National Association of Music Merchants) demos for Roland and Boss with the RC-30, but I like this one from the street.
What we have in these looping pedals is a physical object with a digital architecture that is based on loops and layers. So much of our thinking about digital writing is two-dimensional, or influenced by a flat visual space, whether for images or words. These kinds of technologies for digital sound open up a layered third-dimensional space that produces feedback as part of the writing itself rather than waiting for audience feedback after the text has been produced and circulated.