Mark Percario
Hello and thank you for your interest in ToneShield.  My name is Mark Percario and I perform as a guitarist in many different genres and in many varied situations - breweries, bars, restaurants, festivals, churches and even a yoga studio!  I created ToneShield in early 2019 to solve a problem I was having with harsh, high frequency tones when performing.  My friend and world renowned guitarist Jon Herington explained Speaker Beaming and suggested some possible solutions, none of which seemed very practical to me.  This led me to design a solution that not only solved the Speaker Beaming problem but was also easy to carry - I am very conscious about minimizing the amount of stuff I have to carry to a gig.  Guitarists have enough stuff to worry about, keeping the rig compact and easy to deal with is always forefront in my mind.  
After 8 months and dozens of gigs, I am still using the first prototype with glued hinges and redwood base - I carry it in the back of my amp, where it stays until it's needed again.  
ToneShield is a new venture for me.  I spent the past 30+ years owning and operating Combustion Technologies, which manufactures pistons for aircraft and high performance racing engines.  Being a business owner has been a great experience, but music and guitar make life all the better and I am very grateful for all the opportunities that have come my way.  I have a ReverbNation site if your interested in checking out my musical side and my music is available on all streaming services!