Sounds like something has messed up your configuration. Grid Pie and TrackSelector should both be using “automatic (use available width)”, with Grid Pie set to follow track (read more about the paged navigation concept in the Duplex manual).
In short: if you mean for any two applications to navigate in the same way, you need them to use the same page size.
Have you tried assigning the same name to the track and instrument? Instant synchronization between the two 
Hey, easy, this is what configurations are for.
Simply save the following as “LaunchPad_GridPieFull.lua” in (Controllers/Launchpad/Configurations)
Click to view contents
–[[----------------------------------------------------------------------------
– Duplex.Launchpad
----------------------------------------------------------------------------]]–
– setup GridPie for the Launchpad
duplex_configurations:insert {
– configuration properties
name = “GridPieFull”,
pinned = true,
– device properties
device = {
class_name = “Launchpad”,
display_name = “Launchpad”,
device_port_in = “Launchpad”,
device_port_out = “Launchpad”,
control_map = “Controllers/Launchpad/Controlmaps/Launchpad.xml”,
thumbnail = “Controllers/Launchpad/Launchpad.bmp”,
protocol = DEVICE_MIDI_PROTOCOL,
},
applications = {
GridPie = {
mappings = {
grid = {
group_name = “Grid”,
},
v_prev = {
group_name = “Controls”,
index = 1,
},
v_next = {
group_name = “Controls”,
index = 2,
},
h_prev = {
group_name = “Controls”,
index = 3,
},
h_next = {
group_name = “Controls”,
index = 4,
},
},
options = {
follow_pos = 2
},
},
Navigator = {
mappings = {
blockpos = {
group_name = “Triggers”,
},
},
},
Transport = {
mappings = {
edit_mode = {
group_name = “Controls”,
index = 5,
},
start_playback = {
group_name = “Controls”,
index = 6,
},
loop_pattern = {
group_name = “Controls”,
index = 7,
},
follow_player = {
group_name= “Controls”,
index = 8,
},
},
options = {
pattern_play = 3,
},
},
}
}
As for switching pages, this is what the SwitchConfiguration application does. But it wouldn’t work with Grid Pie, as the application is stopped when we switch away from it. To truly get the feature you’re requesting, we would need something I call “states”, which would accommodate controllers with many virtual pages, as well as hardware with “modifier keys” which change the message being sent from the hardware on-the-fly. This “states” feature is really something which is planned for the long term.
It already does. it’s basically a question of taking a copy of the Controllers/Launchpad folder and editing the device display-name. The process is documented in the Duplex manual
The new version of Grid Pie makes use a of a caching system which could benefit from such a thing. So we’re about to get the functionality you request, but to begin with, you wouldn’t really notice it at all.