I would recommend you set it up like this.
Midi out from the Squid to Midi In SP-16
Midi Out from SP-16 to Midi In AS-1
USB to DAW
Also make sure the following setting are applied to the units.
Midi Clock-Midi DIN
Turn off any midi channels you don't want to use, if your not going to use the 16 channels.
Set 1 channel as a thru so you can get audio from AS-1.
In Global settings set As-1 to slave and also Midi In.
This should make everything synchronize with the Squid Master Clock.
Hope this was helpful,