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([2600:1702:2771:1060:e23f:49ff:fe45:91e6]) by smtp.gmail.com with ESMTPSA id p8sm423439oig.22.2020.12.09.09.25.34 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Dec 2020 09:25:35 -0800 (PST) Subject: How to play audio on stereo device To: freebsd-questions@freebsd.org References: <20201130222149.d7b8783764a036548c29fdd5@web.de> <20201130223849.237eb9fe@gumby.homeunix.com> From: "Jin Guojun[VFF]" Message-ID: Date: Wed, 9 Dec 2020 09:25:29 -0800 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20201130223849.237eb9fe@gumby.homeunix.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Rspamd-Queue-Id: 4CrkTY4nh2z3PlY X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=pVzlZNah; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of jguojun@gmail.com designates 2607:f8b0:4864:20::c30 as permitted sender) smtp.mailfrom=jguojun@gmail.com X-Spamd-Result: default: False [-4.00 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RBL_DBL_DONT_QUERY_IPS(0.00)[2607:f8b0:4864:20::c30:from]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MID_RHS_MATCH_FROM(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[2607:f8b0:4864:20::c30:from:127.0.2.255]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::c30:from]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-questions] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Dec 2020 17:25:38 -0000 I have a stereo sound card, and audio applications only can use one channel at a time. By default, sound goes out to the Rear port (pcm0). If set hw.snd.default_unit to 1, then sound only goes to the Front port (pcm1). Is anyway to configure system to use both front and rear audio channels? -Jin cat /dev/sndstat pcm0: (play/rec) default pcm1: (play/rec) pcm2: (play) pcm3: (play/rec)