First, make sure your synth is set to the same MIDI channel as Touché. By default, Touché sends data on MIDI Channel 1.

If your synth is on a different channel, you can either change the channel on your synth to match Touché, or change Touché's channel to match your synth using Lié.

For more on setting Touché's MIDI channel when using hardware presets, see the Touché User Manual:
https://www.expressivee.com/downloads

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Also check that your synth is actually set to receive MIDI. On some synths this option is not enabled by default, so have a look at the manufacturer's manual to make sure it is turned on.

Finally, a faulty cable can sometimes cause poor data transmission. Try a different cable to rule this out as the source of the issue.