No bro...that´s not the deal. REduce vol is nearly the same as 2-, but you´ll never have this ultra dry bass response 2- has.
Thats the reason i´ve modded mine.
The mod is pretty easy!
You need to drill a new jack or use a speaker out you don´t need. I took a speaker out.
Simply get a shielded mono cable and connct the switch with the jack. The switch needs to stay in pos "-" to make it remoteable.
And as xmartx said, you nedd some of those devices or similar.
That´s all.
And if you do some presets, you´ll need to program this switch.