In order to recover your deleted audio recordings, I want to suggest you to go with the most appropriate solution or simple and guaranteed recovery. I personally use this Android Data Recovery Tool for the recovery of any deleted or lost data from android. You can also directly recover the lost document, SMS, WhatsApp messages, photos, videos, etc with the help of this tool; this software can also be used for other phones like Samsung SmartPhone, and android devices, like Motorola, Sony, HTC, etc. it is the perfect tool to recover back your deleted or lost audio files.
When you record or save any audio speech or video file on your mobile, it gets stored in your phone with .amr extensions. So when you lost your audio files somehow either due to damage or unintentional deletion, you are actually need to recover this .amr files to get back your lost audio files back on your SD card. For the recovery of such AMR files you need to make use of Card Data Recovery software. It is efficient recovery software for .amr files which performs rigorous scanning option of your drive or retrieving back the AMR files after the situation of loss of data.Not only from SD card it can also recover photos and video, music files from SDHC, SDXC, CF, xD, MMC and Memory Sticks. you must try this....it will surely help you!!!