I have been very busy and haven't been able to do much but I present my biggest finished project! You should read the instructions to learn how to operate this. This project can only draw straight lines to save space so it can hold 300 frames. Use the Animation Mode variable to switch between Edit Mode (0), Normal Mode(1), Loop Mode(2). Onion skin frames are translucent ghosts of both previous and next frames to help with animating (search on google if you don't understand). Use the Onion Skin Frames variable to change the number of onion skin frames. Use the Eraser Mode variable to switch between Eraser Mode(1) and Drawing Mode(0). Click the color wheel to change the line color to the color you clicked. Use the Color Wheel Brightness to change the brightness of the color wheel. Use the Instrument and Note variables to give sounds to each frame. Use the Show Save Code to show the code you need to save your project just copy the code, click the green flag and paste the code in the input code place. The rest should be pretty self-explanatory.
I made a remix mode. Just remix the project once you finish making your animation, paste your animation code and click the Set To Remix Mode block. The rest of the instructions are in the project. Thanks to @infinitysausage for the music.