After hours of experimenting with various expressions the [threshold] object in PD solved the problems I was having with false triggering.
Pressing the B button on the wiimote changes the midi channel - Single shot samples are on channel 1, rapid gunfire on channel 2.
I may create a number of variants of the gunshot sounds, associate them with different MIDI notes in the sampler and introduce an element of random selection in PD, this could add variation but would also potentially eliminate the issue of re-triggering a sample before it completes if only non-repeating MIDI notes are allowed.
The left to right gesture isn't the most intuitive for this sound, up and down may be more so. However, using the pitch values would mean that the threshold values would have to be closer resulting in more false triggers (due to the smaller range of motion in the wrist in the up/down direction compared to left/ right). It's likely that the best solution would be to control gun 1 with the nunchuk and gun 2 with the wiimote, though I was hoping to use the nunchuk to control other parameters.
I'm not sure how accurate the sync would be when using this method with video footage.
PD screenshot:
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