From owner-freebsd-users-jp@freebsd.org  Wed Mar 30 13:55:06 2016
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岡部です。

cdcontrolなどを使ってのCDの再生は
cdcontorlはCDドライブに対して何曲目の部分の再生(回転)しろというだけで
音声自体はCDドライブから出力されるアナログ信号(IDEケーブルやSATAケーブル
を通るデジタル信号ではなく、それ専用のケーブルを通るアナログ信号)を
サウンドカードでミキシングして出力してたはずです。

ですのでCDドライブとサウンドカードが音声用のケーブルでつなげられてないと
音は出なかったはずです。

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岡部 勝幸