Hello, I am Telecommunications and Electronics Engineer with deep knowledge on microcontrollers and Arduino systems. I can make your system using an interactive simulation software called Proteus (from Labcenter Electronics), Proteus has every component we need (Arduino board, resistors, keypads, LCD screen, motors, buttons, etc). I have downloaded midi library for Arduino and I have a system sending midi messages by serial port. I have not specialist in music but we can work together, I have developed systems emitting musical notes using buzzers too.
I offer you a warranty above every body I CAN MAKE YOUR SYSTEM BEFORE MILESTONE PAYMENT, that way YOU CAN SEE YOUR SYSTEM BEHAVIOR BEFORE BUY IT. I just need to know that you will hire me, we can follow the next steps:
1-) We agree every little detail, I like to dedicate a lot of time to this step.
2-) I make the system just the way you want and I send you one video with the simulation
3-) Once time you have seen the simulation if you are satisfied with the system you make me the Escrow payment, I send you the project, code, schematic, assembly instructions, etc.
4-) You check the project and free my payment.
Please contact me at chat, you will not apologize. I can develop every logical behavior you need, you just dream, I make it real.
Best regards.