Just to clarify if you have evidence that you plan to introduce during a trial you ARE REQUIRED to disclose this to the other party, in this case the crown, (they do NOT need to ask for it). You must produce the recording for them to review prior to trial. Failing to do so will result in the crown likely successfully arguing that they have not been given an opportunity to review the evidence, and therefore it should be excluded. The crown only needs to provide disclosure on evidence that you already know exists, (officers notes etc), when it comes to evidence that the crown can't possibly expect exists then you are required to disclose such evidence. They, (crown), just as you can with disclosure even request a typewritten transcript, (it MUST be an EXACT transcript, of the recording). The disclosure need ONLY be provided to the crown it is the crown's responsibility to get it to the officers and others who may "have an interest" in the recording.
If this is a criminal incident then yes you will require a lawyer to assist you with all this. If it is merely a HTA charge, (or other provincial act), which is likely to result in a small fine and be heard by a JP, remember JP's have NO formal legal training and the crown is likely to argue to have it excluded.
To give you a reasonable response in which way to proceed, we need to know what the charges were.
Now on a different tactic you said the officer's didn't follow procedure, if you wish to expand upon this, then it is possible that you could file a complaint with the PSU, (Professional Standards Unit, or "internal affairs" of the force involved). The level of having them use the recording is MUCH lower than it is involving the courts.
Further to a couple of points already made ... One of the persons being recorded has to know that they are being recorded. That person can be you. It doesn't have to be the police officer.
Evidence that you plan to use in court is subject to disclosure (to all parties concerned i.e. to the officer in this case) prior to trial. That said, the other party has to ask for it. I don't know what happens if you have such evidence but they don't ask for it. All I can say is that if that happens in a provincial court for a speeding ticket (e.g. you fail to ask for disclosure prior to trial) it sure doesn't stop the cops from presenting and using that evidence against you ...
If the situation ends up in court, let the lawyers sort it out.