[Freesurfer] Troubles using optseq

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Good morning,

I am writing to you in order to ask you some help about optseq. I am struggling using the command cmx . I need to save the paradigms as matlab files (90 paradigms) However, the terminal tells me it is not able to find this function.

Optseq id is $Id: optseq2.c,v 2.22 2011/04/21 19:48:51 greve Exp $ Computer is iMac retina 5K 27 pouces, 2019. 3 .1GHz Intel Core

Here is the text terminal send me :

/Applications/freesurfer/bin/optseq2 \

--ntp 720 --tr 1.25 \

--psdwin 0 16.25 \

--ev foodCHoice1 3.5 25 \

--ev foodCHoice2 3.5 25 \

--ev foodCHoice3 3.5 25 \

--ev foodCHoice4 3.5 25 \

--tnullmin 4\

--nkeep 90 \

--o subcontrolfood \

--mtx firdesign

-bash: --mtx: command not found

Thanks a lot,

Solène Frileux