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"Freq " would be a label and cannot be redefined
you can however
@Freq1 = 416
@Freq2 = 410
@Freq3 = 466

if you need to change the tmr1 interrupt rate the tmr1 reload value needs to be a var

I'm wrong there, I was thinking of ioca/b int issues I had some years back . but after having another look it was with a 16f1825 which has an individual ioc flag for every ioc pin , but it won't...

DT_INTS does not clear the ioc int flag you need to do that yourself either in your isr or when you ready to rearm the interrupt

looks like an Egyptian goddess

https://en.wikipedia.org/wiki/Isis

but it probably this
http:/'s/www.picmicros.org.uk/Interfacing/TUTORIAL.htm

have a look at these threads with dt's guidance I added unsupported interrupts to dt_int18
http://support.melabs.com/threads/392-Dt-ints-18-with-pic18f248...

I have had similar problems , it seems I cut and pasted the asm section from somewhere that included an illegal non printing character. simple solution is to retype the asm section ,remember its case...