MIDI to USB without hairless

Can some1 please help me... i ma a bit rookie to arduino.. i m trying to build a USB drum trigger which can control the sounds of my FL studio.... I have tried it with hairless bt is there a way in which there is no need of opening hairless all the time....need help ASAP

Sure you can use real MIDI hardware from the Arduino and have a MIDI / USB converter on your PC.

Alternatively you can use a Teensy board that has drivers to enable it to look like a HID USB MIDI device.

Finally using the Leonardo and Micro as a MIDI client