随着使用单块效果器的同学逐渐增多，追求好的没有损耗的音色的要求也就越来越多。毕竟大家总是在对美好的事物在不断地追求着么~呵呵。所以一些问题也就随之接踵而来~
最近看见许多人在担心这两个问题：
1、我对音色非常挑剔，我想让我的单块（Boss、Ibanez、Crybaby等）改成True Bypass，我该怎么做啊？改电路？我不会啊~让人改？找谁呢？他给我改坏了怎么办？还是有什么更好的方法，即不用改效果器本身的线路，又能使它变成True Bypass呢？（好象是在做梦？）
2、我好不容易攒了一堆单块，我怎么去切换音色啊？单块毕竟不像合成那样能存储音色，我难道只能一个个的拧吗？还有，我同时想要这个加这个效果，但马上就要换那个加那个效果，我真得要练成佛山无影脚才行吗？还是把我的单块效果器板子当跳舞毯踩吗？
答案是问题当然可以解决的。就是使用true bypass的loop box就可以轻松地解决这两个问题。
关于什么是true bypass（纯直通）就不多说了，吉他中国的老帖里有，这里不再重复。
传说中的nannan（没听说过nannan？没关系。他是传说中的人物。ps:我也是“传说中的竞霄” ^o^ ~）提到过一个Keeley的true bypass looper，这个就是比较简单的让你的非直通的效果器从而实现纯直通的looper了。
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它相当于内部本身就是true bypass的单路的选路器，它的过程是选择从吉他发出的信号是通过效果器输出到音箱，还是跳过这个效果器，从而直接信号输出到音箱。这样就实现了使这个串在looper上的效果器true bypass。
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根据这个原理，我们只要是选择一个AB盒子就能达到同样的效果。不过前提是这个AB盒子本身就是true bypass的。而且最好是带loop的AB盒，因为如果是在两路输出之间选择的话，肯定就得是两个音箱了~这样的true bypass就太“true bypass”了~就连音箱也给pass掉了……汗一个先~ ^_^*
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关于有更多选择踏钮的True Bypass Box，一种很简单的切换方法是每个踏钮对应切换到每个独立的loop里，如果在某组loop里只接一个单块，就轻松地实现了使这个单块True Bypass ~。道理和上面的looper一样~
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这样的多组loop除了能实现true bypass之外的另一个好处是，如果在loop里接上一个单块或一组单块（当然你的单块得够多），把其中一组loop中的单块编辑成一个音色，另一组编辑成另外一个音色，这样就可以通过只轻轻地踩一脚每组对应的踏钮来切换到这个你所需要的音色上面~
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就拿两组loop举个简单的例子：
第一组loop我串的是一个失真，我调节的是重金属摧拉枯朽的节奏音色，第二组loop我串了一个合唱，调节的是有着轻微合唱的clean音色。这样我只通过踩一脚踏钮就完成了从重金属节奏音色到clean音色的转变，而且直接使失真效果器完全的true bypass，不会吃我的clean的tone~
如果有人觉得这是小题大做，我不需要true bypass，我对音色没那么挑；只不过是把失真效果器踩关上、再把合唱效果器踩开，这一共踩两脚的事你只不过少踩了一脚，这样做是多次一举的话，那当你串上更多的单块，使用更多的效果的时候就会发现在音乐进行中转换一个音色能够少踩这一脚是多么的重要。否则真的把效果器板子当跳舞毯那样使真的是不可想象。
以上，由传说中的竞霄（就是我啦~原创作品，辛苦半天大家一定记住我！）提到的这个True Bypass Loop Box其实还是比较简单的，有局限的。因为它比较适用于只是单纯想让自己的单块true bypass或进行音色选择的。而遇到真的需要存储更多花里胡哨的音色，或是喜欢同一个效果器通过调节产生的不同音色，当然如果你有资金买更多的效果器更好。但为了存储这些音色就需要midi踏板了~这个不但能解决单块问题，还能控制机架、音箱等众多产生好音色的元素……（555~~追求永无止境，损失的只是银子……）关于能存储音色的midi true bypass looper就不多说了~~废话就到这了，大家继续讨论吧~
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上图：带midi存储音色的true bypass looper
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可以对机架和单块的效果进行选择
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下面是众多对true bypass loop box的应用组图：
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