In order to convert a mono signal to stereo, connect the signal source to LEFT IN, then connect LEFT OUT and RIGHT OUT to the signal receiver.
The dry signal will be placed in the center, while the wet signal will be spread across the stereo image depending on the STEREO knob's setting.
If you wish to flip the direction of the repeats' stereo movement in Ping Pong mode, swap the LEFT OUT and RIGHT OUT connections. This way, the first repeat will play in the right channel (unlike in the standard connection scheme where the first repeat is on the left). Using RIGHT IN in MONO TO STEREO mode is not recommended.
When both LEFT IN and RIGHT IN are engaged, the pedal goes into dual mono mode and the channels are processed independently (except for Ping Pong mode in the delay section, where inputs are summed). The wet signal in the left and right channels goes to LEFT OUT and RIGHT OUT, respectively. The STEREO knob works as usual.
In this mode, you can plug either a stereo source or two mono sources into the pedal. The two mono sources will be processed together (if the STEREO knob is set past 12:00, there will be no channel crosstalk).
Aside from standard use cases, independent left & right channel processing allows using the pedal in mono for double processing. Plug a mono signal source into LEFT IN, connect RIGHT OUT to the signal receiver, then connect LEFT OUT to RIGHT IN.
The incoming signal will be processed by the pedal twice. Please note that control ranges are significantly altered in this mode. The pedal goes into self-oscillation much quicker, and overloads may happen at various internal gain stages. However, with a bit of practice you can achieve very peculiar results in this mode. Experiment away!