hey Trabant i think you are getting confused because this video does not talk about re- arming trigs.

There are different routines for one shot recorder trigs and one shot sample trigs.

There are also several ways to arm and disarm both kinds of trigs and i think you are getting further confused because you are looking in the wrong place for visual feedback as to the current state of each. Read and re-read this section of the manual and practice them till they become second nature…

an armed trig means that it will be activated when the sequencer passes it , either to trigger a sample or to trigger recording. disarmed trigs will have no effect.

ONE SHOT TRIGS
One shot trigs trig a sample or a track recorder only once. They are especially useful when using the Octatrack as a backing track machine, as they for example can trig very long Static samples without retrigging them once the pattern loops. This trig type is also availa- ble to recorder trigs. One shot trigs are not available to MIDI tracks.
If a track contains several one shot trigs, all one shot trigs of that track will be disarmed once one of the one shot trigs has been activated by the sequencer. This extends to the tracks of other patterns as well. If a one shot trig has been trigged on track 1 of pattern A01, any one shot trigs on the first track of patterns A02-P16 will also be disarmed.
One shot trigs are entered by pressing [FUNCTION] + the [TRIG] key of an existing sam- ple trig. The LED will change from red to yellow, indicating the trig now is now a one shot trig. One shot trigs that have been activated by the sequencer are indicated by alternating yellow and red LEDs. Quickly pressing [STOP] + [STOP] while the sequencer is stopped, power cycling the Octatrack or changing projects will re-arm all one shot trigs. The [STOP] + [STOP] behavior can be disabled in the PERSONALIZE menu. Read more on page 33.
There exists several ways of arming and disarming one shot trigs. While in GRID RECORDING mode and either the RECORDING SETUP menus or the TRACK TRIG EDIT menu with REC TRIG chosen, is active, all one shot recorder trigs of the active track will be re-armed when pressing [ENTER/YES]. The text “ARM REC TRK” will be visible. The one shot recorder trigs will keep re-arming for as long as the key is held. Note that one shot sample trigs will not be affected. This way of arming and disarming can be disabled in the PERSONALIZE menu. Read more on page 32.

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PATTERNS

Pressing [TRACK] + [ENTER/YES] will also re-arm all one shot recorder trigs of a track. The one shot recorder trigs will keep re-arming for as long as the key combination is held. Pressing [TRACK] + [EXIT/NO] will disarm all one shot recorder trigs of a track. These operations can be performed even if GRID RECORDING mode is not active. Nor do the RECORDING SETUP menus or the TRACK TRIG EDIT menu have to be open.
While in GRID RECORDING mode and no particular menu is open, all one shot sample trigs of the active track will be re-armed when pressing either [ENTER/YES] or [FUNC- TION] + [ENTER/YES]. The text “ARM TRK” will be visible. Pressing either [EXIT/NO] or [FUNCTION] + [EXIT/NO] will disarm one shot sample trigs of the active track. The text “DISARM TRK” will be visible. Note that one shot recorder trigs will not be affected. Arming and disarming by simply pressing [ENTER/YES] and [EXIT/NO] can be disabled in the PERSONALIZE menu. Read more on page 32.
If GRID RECORDING mode is not active, all one shot trigs, both recorder and sample vari- ants, of all tracks will be re-armed when pressing either [ENTER/YES] or [FUNCTION] + [ENTER/YES]. The text “ARM ALL” will be visible. Arming one shot trigs in this way can be done while the sequencer is running. Similarly, pressing either [EXIT/NO] or [FUNCTION] + [EXIT/NO] can be used to disarm all one shots trigs. Arming and disarming by simply pressing [ENTER/YES] and [EXIT/NO] can be disabled in the PERSONALIZE menu. Read more on page 32.