I’ve loved the “freeze” effect for years but never actually bought one due to balancing cost with pedal-board space and how often I’d actually use it. I’ve tried to achieve a similar effect using the HX. Given that it doesn’t have a “hold” feature, I’ve used a reverb set to maximum decay to simulate it. All the freeze effects are controlled by a single momentary switch, placed after the EQ and compression blocks.

Split
Set to an even split, then A100 when depressed, so the signal stops being sent to the freeze path.

Reverb 1A
This is for the basic signal, on or off via latching switch, so you’re not “dry” when the freeze is in effect.

Reverb 1B
This has a zero mix until triggered creates the freeze with maximum decay and mix. On release, it return to zero mix and reduces the decay, so the next segment you freeze doesn’t contain the previous one(!)

Reverb 2B
this is so when the Rev 1B is zero mix, the signal dies away after a short interval. It’s off by default so you have a fully dry signal. It’s off by default, the switched on (with tails) when the pedal is pressed. If there were internal send/return levels from path A to B (instead of a split), this probably wouldn’t be needed.

You could substitute (or add) a delay for Rev 1B to alter the “fade out” effect. Obviously, you can try different freeze reverbs & settings to fine-tune the frozen sound, add modulated reverb etc. I’ve since moved the loop block so it picks up on the frozen signal.

The next step is to try using a short delay instead of the reverb with max feedback to see what sound that creates 😉