It should, by default. If it doesn't, you probably have enabled the preference for an alternate set of recording shortcuts (prefs > general > keyboard/multitouch). This set of shortcuts is only active while Reaper is recording. When assigning shortcuts, use the top-right drop-down to make them for the "main (alt recording)" section.
Spacebar is really easy to accidentally bump and wreck your in-progress recording, so I'd recommend using a less easy to press key like 's'.
|