Power management on a Mac

Dear Hauptwerk friends,

Power management has already been discussed at various points, via master-slave sockets, etc.

With my instrument I could not solve the problem satisfactorily until today.

Organ ON
When I turn on my Mac Mini manually via the computer push key, the other electrical devices (MIDI electronics, organ light, audio interface, active speakers) are switched on via a master-slave power strip.

Result: There is a moderate switch-on noise. (At the beginning, the fuse was always blown out. This I have now replaced by a sluggish circuit breaker.)

Desired solution: Actually, the speakers would have to be switched on with a time delay. But I have not found a power strip with timed freely configurable relay for it.
After all, this power strip makes it at a fixed interval: https://www.toolab.de/deutsch/powerseq-501/


Organ OFF
To turn it off, I use the shutdown software button in Hauptwerk.

Result: After shutting down the MacMini, you will hear a very loud unpleasant switch-off sound. Only when the MacMini is turned off does the master-slave power strip take away the power from all electrical appliances. This leads to a loud bang, which is certainly not good for the speakers permanently.

Desired solution: I would prefer a shutdown script from the computer, which turns off the speakers first. Only then can the computer and the other technical devices switch off.
Does anyone know a Mac software that can send commands to a power strip when switching off? Has anyone ever used this software? https://www.dssw.co.uk/index.html

I would be very happy about all hints and solutions from the forum.

With kind regards
Sven

This power sequencer board (which can be used to control outlets in a plug strip) is very function flexible for the switching requirements that you mention albeit somewhat involved in the initial programming.



https://www.ebay.com/itm/1-PCS-DC-12V-8ch-Cycle-Delay-Time-Relay-Timer-Control-Switch-Power-sequencer-PLC/173923927566?hash=item287eac860e:g:wQsAAOSwCA5ba6mx

A simpler, less flexible sequencer:

https://www.ebay.com/itm/250V-Power-Time-Sequence-Module-0-2-4S-Adjustable-Sequential-Controller-Module/352622705040?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20131003132420%26meid%3Dbcafdd8a43e844928f9acec509ddcc7b%26pid%3D100005%26rk%3D2%26rkt%3D5%26sd%3D392294626915%26itm%3D352622705040&_trksid=p2047675.c100005.m1851

This sequencer most likely would need to have the timing interval increased. I believe that can be done by means of a special request. It would involve a component (resistor) change. With the speaker (amplifier(s) being connected to the last channel. (last on, first off).

Rgds,
Ed