"Karl Zemlin's wizardry is behind every concert of the Indy Folk Series. Artists invariably are pleased at the live sound and amazed at the quality of Sonic Artistry's digital recording. We're starting to see 'Live from the Indy Folk Series' albums, thanks to knock-your-socks-off audio that brings out the best in our whole gamut of performers."

"Karl: FABULOSO!!  I just listened to the before and after and I am totally stunned!  What a great job you did...thanks so much.  Moreover, it's been a real pleasure to deal with a person who is not only talented but straightforward and honest as well.  You can be sure I'll recommend your service at every opportunity."

"Thanks Karl, We are so happy with our recording! The kids who participated in the program are walking on cloud nine. I am not sure how many kids have had this opportunity before but I hope it will encourage others to use the talents they were born with and allow them to feel free enough to share these gifts with others. We will be pleased to recommend you to anyone who wishes to record."

From Violinist William Harvey regarding restoration work on recordings done by others:

"Thank you so much for your really brilliant work on my composition demonstration CD. It is thoroughly professional now and I am quite thrilled. What you did with those two problem tracks (the piano piece and the piano/vocal song) was little short of miraculous; I had never expected to hear them so clearly. I remain very impressed by the high quality of your work!"

From Story Teller Sandra Harris about her award winning Audio Book 'A Girl Called Tootsie':

"Dear Karl, Your expertise, patience, and sensitivity toward my material  helped  make my storytelling CD  the wonder that it is and helped it win a  national award!  Your suggestion for the music was inspired.  I can't thank you enough."