First select trace 3
TRACE/TRACE/TRACE 3
now enable trace 3
TRACE/ENABLE
trace 3 is now enabled, just like trace 1.
now set trace 1 in max decay mode
select trace 1
TRACE/TRACE/TRACE 1
and enable max decay
TRACE/CALC/MAX DECAY
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For more info on the tinySA go to https://tinysa.org/wiki/