如果合同条文模糊，在合同内和其他条文矛盾，合同外的证据可以用来解释合同。这样你的录音，口头证据之类的，就可以拉进来考虑了。这是普通法合同法的原则。http://en.wikipedia.org/wiki/Parol_evidence_rule
但是还要看你在哪个州。Wikipedia: "In a minority of U.S. states, (Florida, Colorado, and Wisconsin), the parol evidence rule is extremely strong and extrinsic evidence is always barred from being used to interpret a contract. In most jurisdictions there are numerous exceptions to this rule, and in those jurisdictions, extrinsic evidence may be admitted for the following purposes:
。。。
To aid in the interpretation of existing terms.[5]
To resolve ambiguity using the contra proferentem rule.
。。。
To correct mistakes."
但是证明这些，不懂合同法的各方面的联系，你自己去说，说不来的，你不请律师，人家以为你是胡说，谁会上心？非常技术性的讨论，只有出庭告。
但是还要看你在哪个州。Wikipedia: "In a minority of U.S. states, (Florida, Colorado, and Wisconsin), the parol evidence rule is extremely strong and extrinsic evidence is always barred from being used to interpret a contract. In most jurisdictions there are numerous exceptions to this rule, and in those jurisdictions, extrinsic evidence may be admitted for the following purposes:
。。。
To aid in the interpretation of existing terms.[5]
To resolve ambiguity using the contra proferentem rule.
。。。
To correct mistakes."
但是证明这些，不懂合同法的各方面的联系，你自己去说，说不来的，你不请律师，人家以为你是胡说，谁会上心？非常技术性的讨论，只有出庭告。
