I want to upload audio files onto MP3 trigger using USB rather than removing and loading onto microSD and also retain the 18 manual switched trigggers. Is this possible, or is there another product that can achieve this ?
Unfortunately the MP3 Trigger’s SD card can’t be accessed through USB, but you might have a look at the [Qwiic MP3 Trigger. That will show up as a USB drive when connected to a computer.](SparkFun Qwiic MP3 Trigger - DEV-15165 - SparkFun Electronics)