Arduino Shield compatible Synthesizer

Electro Mechanical - CUI spring loaded 45 degree entry PCB connectors - 5 mm spacing

CUI website - Spring Loaded Terminal Blocks - TBL005a-500-series
Mouser website - CUI Spring Loaded Terminal Blocks - TBL005a-500-series
Data Sheet - CUI Spring Loaded - TBL005a-500-series

Electro Mechanical - CUI spring loaded Top entry PCB connectors - 5.08 mm spacing

CUI website - Spring Loaded Terminal Blocks - TBL004v-508-series
Mouser website - CUI Spring Loaded Terminal Blocks - TBL004v-508-series
Data Sheet - CUI Spring Loaded - TBL004V-508-series

Electro Mechanical - CUI spring loaded Top entry PCB connectors - 2.54 mm spacing

CUI website - Spring Loaded Blocks - 2.54mm centers - TBL003-254-series
Mouser website - CUI Spring Loaded Terminal Blocks - TBL003-254-series
Data Sheet - CUI Spring Loaded - TBL003-254-series

Electro Mechanical - Amazon spring loaded Top entry PCB connectors - 2.54 mm spacing

Amazon - Spring Loaded Terminal Blocks

Electro Mechanical - CUI 1/8 inch phone jack

Mouser - MJ-3502 Phone jack 1/8 inch right angle PCB THD mount with threaded bushing
Mouser - SJ1-3533 Phone jack 1/8 inch right angle PCB THD mount with threaded bushing
Mouser - SJ1-3543 Phone jack 1/8 inch right angle PCB THD mount with threaded bushing

Vertical mount Potentiometer