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#boxx #gt-10 #gt10 #tech #21 #tech21 #power #engine #60 #guitar #pedal #multi #effects #amp #doug #doppler #music #recording #live #performance #sweetwater #sweetwater.com #tech_21_power_engine_60 #boss_gt_10 #boss_gt-10 #boss_gt10 #tech_21_trademark_60 #tech_21_power_engine #gt_10 #tech_21_trademark_10 #boss_gt_10_patches #tech_21 #boss_gt_10_metal #power_engine_60 #boss_gt-10_patches #doug_doppler #tech21_power_engine_60 #boss_gt_10_review #boss_gt_100 #boss_gt_100_liveComments: