Perhaps it is the tte addon that Ian Clark wrote in 2012? It is accessed in 
Package Manager under debug/tte and once downloaded can be brought into the 
environment with load 'debug/tte'

It creates an adverb to convert tacit to explicit. Information is found in 
ABOUT_tte_

    (+/ % #) tte
3 : 0
        NB. +/ % #
] s0=: # y
] t0=: +/ y     NB. main: h-: ,'/'
] r0=: t0 % s0  NB. fork: (+/) % #
:
] s0=: x # y
] t0=: x +/ y   NB. main: h-: ,'/'
] r0=: t0 % s0  NB. fork: (+/) % #
)

Cheers, bob

> On Oct 24, 2022, at 08:00, Gilles Kirouac <g1...@myriade.ca> wrote:
> 
> Richard
> If you are looking for the trace script, it is in
> 
>          addons\general\misc
> 
> See also
> https://wiki.jsoftware.com/wiki/Guides/Language_FAQ/TracePhrase
> 
> ~ Gilles
> 
> Le 2022-10-24 à 01:45, Richard Donovan a écrit :
>> Many years ago (J4 or J6) I remember there was a function that showed how 
>> hooks and trains etc were expanded, using such output as x _f_ g_ y etc 
>> (where _f_ indicated dyad etc). Does anyone know of this and whether it 
>> still exists?
>> 
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