During his career Rennie also designed various instruments used in shipbuilding.

He designed several medical instruments including an improved obstetric forceps.

He also continued to design and build new instruments to play in this tuning system.

He designed pottery, furniture, book bindings, and musical instruments.

He learned how to design electrical instruments for doctors.

He also designed several instruments and a notation system for microtonal music.

He designed specialized medical instruments called dermal elevators for this process.

He has also designed and built new musical instruments.

Finally, the most concrete challenge will be to design cost-effective instruments.

The noise band features open improvisation using artist designed instruments and found sounds.