摩擦 is a 技能 联合 with reel to reel 磁带 录音机 If the motor of the 磁带 录音机 is disengaged the 磁带 may be moved manually against the 回放 head 按常理 used as a 技能 to identify a detailed edit point the 技能 was also widely used as a 声音 处理 技能 i e 时变 转换 and backwards forwards alternation Thus 摩擦 can also be used as a 形(曲)式 of 创造力 滥用 Today this 技能 can be 数字 simulated