Using ReverseName option

[HardBop]

(13-01-2021 17:48)simoncn Wrote:  Another option (simpler) is to put ComposerSort:Composer in indexTags instead of Composer. If you do this, you should add Composer to itemTags so that the "firstname lastname" form is sent to the control point for display. With this approach, you don't need anything in tagValue.

Thanks Simon, your last solution works and is simpler.
I was actually coming back to you on your previous solution because when I used a different control point (Lumin and Kazoo) it had ordered them by Christian name even though Surname was first e.g. Rousell, Albert before Liszt, Franz. However, on the Naim App, which has the choice of "Server default" or "alphabetical" it worked fine for alpha order but as per Lumin and Kazoo for server default.
All control points fine now with your last option! Thanks.