F# string 7 on e9th tuning

[Brian Henry]

When using the 7th string which other strings does one use to create a harmony? Many thanks. Brian

[Dave Grafe]

There are a lot of options depending on what chord(s) are active and what you intend to do with them. With no pedals the 7 string is the 9th of the E major, with A+B pedals it is the 6th of the A major, with B+C pressed it is the root of the F# minor, with Eb lever alone it is the 5th of the B major. With Bb+Db levers it is the root of an F# 7+9. Only scratching the surface here, but from this one can begin extrapolate the available passing harmonies. I hope.

[John Larson]

I guess unison is technically an interval.
If you've ever listened to the sacred steel guys especially Robert Randolph their style has a big emphasis single note lead lines often on one string with a healthy dose of vibrato reminiscent of a singer.
If you have the F# to G# knee lever change this makes a unison with the string 6 G#. Very handy for doing the aformentioned lead lines and the two strings makes it kind of strum able for a chorused type sound.
Here's a thread where many including Paul Franklin chime in on the ways to approach this type of sound on E9.

[Rich Ertelt]

With A and B down, it give you the 6th. I use this a Lot emulating non pedal or faking swing stuff. I play a single neck but used to play a lot of non pedal C6.

It is also super handy doing lines with the 6th string, especially with the B pedal.

[Michael Hill]

A super common use is with AB down (or AC down). Use string 7 instead of 8 and you have a minor chord.