Any way to add more instruments to this program?
This is discussed in the FAQ here at our web site. This has also been discussed at length in past forum threads. Here are some to get you started on the subject:
https://forum.noteworthycomposer.com/?topic=1387, https://forum.noteworthycomposer.com/?topic=925, https://forum.noteworthycomposer.com/?topic=940, https://forum.noteworthycomposer.com/?topic=1298, https://forum.noteworthycomposer.com/?topic=1342, https://forum.noteworthycomposer.com/?topic=853