I'm planning on building a PVC Train Horn kit based on Dozerboymiller's instructions, but haven't found anywhere with what tuning to tune each horn itself. I'm wanting to either do an RS3L or RS5T, so if anyone could point me on how to build them, let me know. Thanks
For an RS3L, you need a B inverted 7th chord (B, D#, A).
For an RS5T, you need a B major 9th chord (B, D#, F#, A, C#).