AntonySharmman,
Assignable buttons in PaSeries have only momentary action and they always reset their state to off when changing STS.
The right way to retain a scale of a specific STS without pressing any controller is to define custom scale tuning via Sub-Scale
mode and save it in particular STS properties you need it.
Thanks for your suggestion. I know this option and it could be very convenient if we play regularly the same songs with the same singer.
Since the complexity of some middle eastern music regarding scales, and besides that I play with different singers with their different scales (could be any scale from A to G with 1 to 3 quarter tones simultaneously in one scale) I prefer to have any sound in their natural temperament and set the quarter tone in live while performing.
Assignable buttons in PaSeries have only momentary action and they always reset their state to off when changing STS.
Do you mean all Pa series. I used the Pa 80 for the years and I assigned one of the button to quarter tone and it kept the setup unchanged every time even after rebooting the keyboard for the years.
Just FYI, It seems that the Korg Pa3X can hold unchanged the Assignable button configuration after rebooting the keyboard, according to BillyHank's previous post. Because we were talking about this problem in Pa900.
Anyway thanks for your help and appreciated.