@SotarHero1 No probs, yes I do sell mixers but if you are handy with a soldering iron they are easy to make, take a look on instructables for “passive mixer”
The problem with these Belkin type things was started by well meaning but ill informed people, there is an interview wiith the Volca designer where the guy who recommended it has corrected the misinformation here: http://www.generalimprovement.co.uk/Interview.htm