From nobody Wed Oct 02 00:39:03 2024 X-Original-To: freebsd-multimedia@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4XJGCJ04ymz5XdyY for ; Wed, 02 Oct 2024 00:39:08 +0000 (UTC) (envelope-from christos@freebsd.org) Received: from smtp.freebsd.org (smtp.freebsd.org [IPv6:2610:1c1:1:606c::24b:4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R10" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4XJGCH6L0tz4CHp; Wed, 2 Oct 2024 00:39:07 +0000 (UTC) (envelope-from christos@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1727829547; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=nNFmgbO700vgkZWi9lT1GS8Qmp1N0UxuKCsf7NpssG8=; b=cNWkLYCeZK+Gdr9qLHpxKygUlTrXibHEdV2kjywddIc3kufoLbxFS1DJm6TEmjVPMz+hmY nzj35yDp7l96jQNr70HSW5RKTq9H8Kh+4YwdF/Ro06jPLUx/grfGl8ejTbiak4pTAhDpa4 BRWvXf8NeJECmVMc3wtwIPCAuQQmRod/GYlXnLGGGpNT2XwIAsBTptv8A0Lx8wjKduApFv Vy3UbKyrKRRW9GMFoyoVbmONxXA134L9DtQkCQsfJMaTAW/dXOxc9rBcKcvbw6C69jOIR8 ci/Q0v0jrhCDz4FMAIkSHGCXJj+cT2uZMh9er1/Jglz+7rLkVd76y23VjMFmKA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1727829547; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references:dkim-signature; bh=nNFmgbO700vgkZWi9lT1GS8Qmp1N0UxuKCsf7NpssG8=; b=HI1ZssJVyo+KVH5vcNKltPM65p25S3xe2095MRFpKGY41XWKKh9pXhxTVWut+n3+jr2kUa EygZrYpTtA56wfs/T0H3vqESbBganeYiSq/g1Mzz1Pk40T3KguRWn38sX3hhEbIB7DGWqT fmLqqHib80GXhdK9VM9D4N8fmz/PqQSZtuZT+LR6HArVh2ssBGJ0YkL86Qus4DxwXYEv72 eWB5SzZKQhWPxoXa7o7IF8bz8xZ61QwlfhOPUsUem7CIUqCYBDv9XBPwUnNiEDF+o7IgV9 Y8Z8YpPDm7nzmYe797UMtLGyLDk0wYHpZOzneJaJ8YefAw1kfCeQ+ZJrsdoChA== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1727829547; a=rsa-sha256; cv=none; b=oDnUbZL9usqMuNhbRIozeKMOqBh7b8bawGaz4L4evZjFoh1FbSIs/FhPC4aHf/YfBl7Fan eHHtoE3ZGhMuDLebmt+pZD/+/BxvCY1aUF7DExCrrdiBzMArU/QPCJD8tDF5EGyVjUXI2m kVO58gciP39VVA0+vDeO55BYCu3V08eUQuUBqMegibpPagMTqeA6U4dxJzy+UBWjpBhHk5 SW2b4F8t9QqwgnDREqbaslh6x2SlwwBb7q1BE6NmOv1iERgZFxsOQ29kLQLMcrBtigMhhO NbFpQFYg4vrTYXRoAPraCg1i0+XB1fuzMAloZVhYwKjIG8Vq3x1BxiI3jd4Zdw== Received: from margiolis.net (mail.margiolis.net [95.179.159.8]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA512) (Client did not present a certificate) (Authenticated sender: christos/mail) by smtp.freebsd.org (Postfix) with ESMTPSA id 4XJGCH3cHTz1JRp; Wed, 2 Oct 2024 00:39:07 +0000 (UTC) (envelope-from christos@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; s=mail; bh=pm/9nUG9T9bn+wr ukwDUzzDsD/ubFJXnV9awcp+XtRk=; h=in-reply-to:references:subject:cc:to: from:date; d=margiolis.net; b=ndmBNLCEST0NCQvowN6ycOWtF2PZvlCnOfJEYoa0 TDrknQJrjoMzkJm2WV9NAsfu7VV1Mpedj/tLwJm9iLjqK+59C575IvK8rLiuWbWdLsHXCG x/sk+ggbYDoqKy50Bjcs4AlCeBHDDcIUJc547WlcGgdpTubzElukPjv9w4DS4= Received: from tpad (31-217-175-193.cgn.acro.cosmote.net [31.217.175.193]) by margiolis.net (OpenSMTPD) with ESMTPSA id 7fae050b (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Wed, 2 Oct 2024 00:39:04 +0000 (UTC) Date: Wed, 2 Oct 2024 03:39:03 +0300 From: Christos Margiolis To: John David Duncan Cc: freebsd-multimedia@freebsd.org Subject: Re: some help getting started with multi-channel USB audio Message-ID: <2lejqhg7t5ypf2ashwlug6d5mztuen5xaedotz4hvyxsvefwqj@jmj25ywand5f> References: List-Id: Multimedia discussions List-Archive: https://lists.freebsd.org/archives/freebsd-multimedia List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-multimedia@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hello John, John David Duncan wrote: > Hi, > > I have a 15-year-old computer newly installed with FreeBSD 14.1, plus > a 2nd gen Focusrite Scarlett 6i6, and a Novation Launchpad Mini. > > The Scarlett 6i6 is an older interface with 4 A/Ds and 4 D/As, plus 2 > digital pass-through channels. The Launchpad is just a MIDI > controller with some lights and some buttons. My intent is to set this > up without any monitor or keyboard, and then use the buttons on the > Launchpad to control recording and playback from the various channels > on the Scarlett. > > Here's where I'm looking for help: what can I do to get independent > access to the six channels on the interface? Is there maybe some > combination of sndio / oss / alsa / jack that will nicely present each > channel as a device? You might want to look into virtual_oss. Its man page also has examples on how to split multichannel audio to subdevices. Christos