No need to spend a fortune, you can add a remote to any passive, this kit suits my Lightspeed Attenuator for $19, don't know how long the hand remote will last, that why I don't supply them.
https://www.ebay.com.au/itm/9V-Infrared-Remote-Control-Volume-Control-Board-ALPS-Pre-AMP-Motor-Potentiometer/322328825653?hash=item4b0c4b8f35:g:wdMAAOSwjXNbESAy
Here many more for other passive use.
https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR1.TRC0.A0.H0.XRemote+control+volume+.TRS0&_nkw=Remote+control+volume+&_sacat=0
Cheers George
https://www.ebay.com.au/itm/9V-Infrared-Remote-Control-Volume-Control-Board-ALPS-Pre-AMP-Motor-Potentiometer/322328825653?hash=item4b0c4b8f35:g:wdMAAOSwjXNbESAy
Here many more for other passive use.
https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR1.TRC0.A0.H0.XRemote+control+volume+.TRS0&_nkw=Remote+control+volume+&_sacat=0
Cheers George