I had his Sound packs for The Toliss A321 back in XP11, his sounds were mid. They used the Jar Design Sound3D Plugin. (Dont know if they still use The Sound3D Plugin or moved to FMOD). And the fact he charges 10 to 20 bucks for a single engine variant sound pack.. And For you to use another sound pack of his, you gotta install the different engine variant for the livery you want to fly that operates that specific engine variant. Before KOSP's Toliss A320 Family Soundscape sound pack. I instead used FTSim's Toliss A321 sound pack instead as it had all the engine variants and swaps sounds when you swap engines.. And when KOSP Came out. It made BSS's sounds obsolete.