Enclosed picture shows, the thinking is to have that little control cause a 'capacitor-like' (participation in circuit).
So, any downward flow goes thru the transistor, but the other direction is possible. That is only approx, however, but forgetting the diode has voltage drop, the 'typical' touch circuit could still sense enough to (decide to toggle the lamp channel).
Now, in view is R1, that allows 12 V modules to directly interface, with caution...
My best est is, the dual-in-pack IC is small, might be one output, at I=20 mA other ch max of 300 mA.
The input, will be triggered / toggled, by the likes of push-button, a CD-4017, a garage light (motion), at 6VDC, etc, including AUDIO, that's, from now on, something worth trying, mixing modes...
Heck, I need to try, use of LED, to trick motion detector, that way there is 8 second timer!
(The garage wall mount motion sending would light up, for 8 seconds, when activated.)
Prob start R1 at 10 k, with gain roughly 40, gives 20 mA or so, but reduce R1, slightly as needed.