Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to disguise your voice [title] Download a voice-changer app. [step] There are a variety of smart phone apps for iphones and androids that you can use to change the sound of your voice, many of them free. New apps are always coming out, so check out the app store to find out what's available.

Ending1: [substeps] Look for a voice-changer app that is compatible with your iphone. If you want to make sure your iphone is able to record your voice, make sure to sync your iphone to an ios device that provides a separate network on your iphone. Ending2: [substeps] Some of them allow you to record your voice and play it back in manipulated form, while others allow you to speak into the phone and project weird robot noises and other big changes. One app, call voice changer, even lets you make calls with your new fake voice. Ending3: [title] Look for an acoustic, electronic instrument. [step] There are lots of different guitar tuners online, and sometimes more than one. Ending4: After booking it, try to get the one that fits the sound you want. [title] Log in to a voice-changer app.

Answer format: ending1/ending2/ending3/ending4