About expanding additional THRU ports

[zwrr]

Thank you for creating this project. I have used the Input Switch module and combined it with the MT-32 Pi into one unit.

Now I have a problem and hope to get your help. There are 3 THRUs in your design. I use them for the built-in MT-32 Pi and two external connections MU90 and SC-88PRO. I recently got the SC-55 and SC-55MKII, and there are no extra THRU ports available.

According to your design drawings and the information of 74HCT14, can I use the four idle pins 1, 2, 3, and 4 of 74HCT14 to manually expand the additional two THRU ports?

I am a beginner in circuit design and hope to get your help. Thank you.