~ruther/qmk_firmware

ref: a5e33b1c28cb774a038b1c0e4fed0da9f757def1 qmk_firmware/users/ericgebhart/defs/alt_shift.def -rw-r--r-- 150 bytes
a5e33b1c — Nebuleon Allow the user to select one tone for the additive DAC (#21591) 2 years ago 
                                                                                
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// alt shift. Give an existing key code,
// and maybe an alternate shift keycode.

ALT_SHIFT(US_EXLM, US_PERC)
SHIFT_FOR_2(US_AT)
SHIFT_FOR_3(US_DLR)