…honestly, i think the idea of trying to get a Venus 2k, Tremblr, etc working with a Handy is doomed from the outset. The essential nature of closed loop vacuums is that they utilize the vacuum to provide motive force, and suction on the cock as a by product. The cock is separated from the piston vacuum by a membrane, so a secondary vacuum has to be created around it by the chamber, with a one way valve. This then fights any kind of [up_down] you want to program your Handy with. You could run a V2k like a Hysmith or vibrator script, altering the intensity, playing with the solenoid for differing suctions, but it’s never gonna be the same thing.
However, if the mission brief is actually, ‘i wanna scriptable sucking and fucking machine’, then i know how to get you there… been doing it for years… only it isn’t actually a scriptable machine… yet… lemme explain…
What you need isn’t closed loop vacuum, but open loop. Not that it doesn’t come with its own set of inherent problems, but it does happen to work perfectly with an [up_down] axis. In open loop, the vacuum from the piston is applied directly to the penis. The end of the pipe is essentially open to the atmosphere, and all that’s in the way is the clever design of the sleeve and one’s genitals. i have a thread about it here LINK (apologies to those that have already read it), and i have to confess it’s desperately old and needs updating, but you get the general idea of my approach.
Imagine the illustration in the YouTube link above, but with a sleeve instead of a cylinder, affixed at the top, and the solenoid drives a switch, for a one way valve, so the piston is [pulsing] or [sucking]. The pump could then be driven directly by a script (unlike in my set-up, where i have to manually adjust speed in steps) to synchronize with the Handy, if desired, though conflicting elements in this set up tend to synergies, and it’s not always necessary to smooth them out… they just work, it’s difficult to explain. Chaos theory meets masturbation, go figure.
Biggest problem is that there needs to be a really good match between the penis and the sleeve, so the suction is perfect. It kinda needs to be sized right, and i have no idea how to scale that up or down (i have only one penis). Hopefully it’s just a case of upsizing the sleeve. Interestingly, the Handy strap is positioned in exactly the right place (at the base) to produce the required vacuum effect over the head.
i could go on at length about how the many different variations of [valve_on/off] vs [pump speed] vs [handy_speed/position] affect the feels… it’s quite astounding… i’m learning new stuff all the time, and i’ve been doing this for ages already…
Best hobby ever…