Cisco ASA policing

When creating policy-maps and the included classes, does class-default policing apply to all traffic or is it just traffic that is not matched further up, much like an ACL works?

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For example see below:

class-map voice

match dscp ef

policy-map qos_class_policy

class voice

priority

class class-default

police input 70000000 35000

police output 70000000 35000

inspect pptp

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Would this limit voice/EF traffic to 70mb as well, or is the policer for "class-default" irelevant if the voice traffic has been matched in "class voice".

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One final question, is the effects of a policer limited to a "stream" or is it the total of all traffic i.e. policing at 70mb, would be 2 source's at 35mb full throttle each (70 combined), or 70mb each?

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thanks!!