Yep, there was some WAV form audio analysis conducted on those recordings the Ukrainian SBU provided and the studio engineer analyzing the audio determined that the conversations that were presented were switching from mono to stereo and had various anomalies within the recording, thus the evidence had been likely created in a studio and was not simply phone conversations that were intercepted. Of course, the DSB completely ignored this fact and went ahead with their 'investigation' with a predetermined result and Ukraine (one of the alleged possible culprits) completely onboard with the investigation itself. They even provided the new Ukrainian authorities the right to reject any findings that paint Ukraine in a bad light. Thus, the whole thing has stunk to high heaven since the very beginning.
I also compiled quit a lot of important evidentiary material related to the MH17 case at the following link:
https://clarityofsignal.com/tag/mh-17/
Also the original BBC eyewitness videos and statements were deleted from You Tube by the BBC themselves. These eyewitnesses saw a Ukrainian fighter jet. Their statements at the time of the crash are archived here (it has since been cached and reuploaded by other people concerned of a coverup by the BBC):