i've been using the original Lehle Volume pedal for years, the one as big and heavy and solid as the old Benz /8, and i'm still using it – but.
at home, where i keep a small pedalboard on the floor under the desk, the original one doesn't fit... so i counted up to 20, trying to resist throwing some further money to another piece of gear – and finally surrendered to buying this.
it does all that the big one does, and better – because.
level setting, on this one, is quantized: you press once, twice (three times a lady) – and your level is perfectly "reproduced" like last time you used it.
why this matters?
because you have to get back to "old" recordings (that track, that signal chain, that guitar), and make an edit on the fly, one that shall fit like it was done exactly on that day, on that time, in that take, on that session – so level must match first and foremost, of all things!
level on its big brother is a potentiometer – smooth, great looking, protected against accidental misuse, but still a pot that you can easily place 5 or 2 or 4 degrees away from where it was meant to be (unless min or max, of course)... this pre-set push-button setting is simply bullet-proof, instead: always at that same exact level.
feel-wise and sound-wise, this Mono Volume S works exactly like the standard Lehle Volume Pedal: the one after which all other volume pedals i have can only be dusted from time to time – it's just size-wise smaller (which helps, in my case).
ps: beside its use for setting volume or making swells, the bit that hardly anyone notices is that, from its output onward, your signal runs to destination "caged" in a solid, protected path, impedance-wise... dead-silent, impervious to stray magnetic fields and RF interferences – and (even better): your guitar's tone and volume pots now scale your signal perfectly smooth, without sudden peaks or dips, across their entire rotation, too, because its active circuitry doesn't load your passive controls [and, if you have guitars or basses with active circuitry, too, like i for myself have: it works its magic with them just the same]!