When upgrading to any version of Firmware 18 from any version of Firmware 17.04 or earlier, you will need to adjust the new USB Return Level parameter in the I/O menu. It is set to -60 which is very quiet. Recommended settings are -6 or 0.
Read my article for more information: USB Playback is very quiet or silent after updating Firmware to 18.01 or higher
Also check out any of these threads asking the same question:
http://forum.fractalaudio.com/axe-fx-ii-bugs/97447-volume-issue-[not-bug].html
http://forum.fractalaudio.com/axe-fx-ii-bugs/97781-18-03-usb-return-level-60-[fixed].html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97965-no-sound-computer-since-18-03-update.html
http://forum.fractalaudio.com/axe-f...yback-volume-something-i-did.html#post1175535
http://forum.fractalaudio.com/axe-fx-ii-bugs/98284-after-latest-firmware-update-can-hear-guitar-but-not-mac-output-[not-bug].html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98443-post-fw18-issue.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98375-question-volume-newbie.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98308-no-sound-system.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98094-problem-usb-analog-output.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98045-using-axe-fx-soundcard.html
http://forum.fractalaudio.com/axe-f...very-low-playback-volume-something-i-did.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97965-no-sound-computer-since-18-03-update.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97973-axe-volume-vs-usb-volume.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97814-low-sound-help.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97846-playback-volume-drop-after-fw18.html
http://forum.fractalaudio.com/axe-f...xe-fx-sound-card-mac-not-working-anymore.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97707-upgraded-18-03-latest-axe-edit-today.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97721-axe-sounscard-dosent-work.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97625-volume-issues-18-a.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97650-low-output-volume-after-fw18-upgrade.html
http://forum.fractalaudio.com/axe-f...tput-through-axe-monitors-barely-audible.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97448-problem-usb-audio.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97497-sound-problem-please-help.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97434-usb-level-return.html
http://forum.fractalaudio.com/axe-f...x-ii-firmware-18-01-released.html#post1168570
http://forum.fractalaudio.com/axe-f...x-ii-firmware-18-01-released.html#post1168577
http://forum.fractalaudio.com/axe-f...x-ii-firmware-18-01-released.html#post1168628
http://forum.fractalaudio.com/axe-f...ii-firmware-18-01-released-2.html#post1168722
http://forum.fractalaudio.com/axe-f...ii-firmware-18-01-released-3.html#post1168775
http://forum.fractalaudio.com/axe-f...ii-firmware-18-01-released-6.html#post1170682
http://forum.fractalaudio.com/axe-fx-ii-discussion/98637-no-sounds-computer.html
http://forum.fractalaudio.com/showthread.php?t=98685
http://forum.fractalaudio.com/axe-f...snt-work-interface-fw18-07-a.html#post1184608
http://forum.fractalaudio.com/axe-fx-ii-discussion/98838-probably-simple-question.html#post1185983
Read my article for more information: USB Playback is very quiet or silent after updating Firmware to 18.01 or higher
Also check out any of these threads asking the same question:
http://forum.fractalaudio.com/axe-fx-ii-bugs/97447-volume-issue-[not-bug].html
http://forum.fractalaudio.com/axe-fx-ii-bugs/97781-18-03-usb-return-level-60-[fixed].html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97965-no-sound-computer-since-18-03-update.html
http://forum.fractalaudio.com/axe-f...yback-volume-something-i-did.html#post1175535
http://forum.fractalaudio.com/axe-fx-ii-bugs/98284-after-latest-firmware-update-can-hear-guitar-but-not-mac-output-[not-bug].html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98443-post-fw18-issue.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98375-question-volume-newbie.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98308-no-sound-system.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98094-problem-usb-analog-output.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/98045-using-axe-fx-soundcard.html
http://forum.fractalaudio.com/axe-f...very-low-playback-volume-something-i-did.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97965-no-sound-computer-since-18-03-update.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97973-axe-volume-vs-usb-volume.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97814-low-sound-help.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97846-playback-volume-drop-after-fw18.html
http://forum.fractalaudio.com/axe-f...xe-fx-sound-card-mac-not-working-anymore.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97707-upgraded-18-03-latest-axe-edit-today.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97721-axe-sounscard-dosent-work.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97625-volume-issues-18-a.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97650-low-output-volume-after-fw18-upgrade.html
http://forum.fractalaudio.com/axe-f...tput-through-axe-monitors-barely-audible.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97448-problem-usb-audio.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97497-sound-problem-please-help.html
http://forum.fractalaudio.com/axe-fx-ii-discussion/97434-usb-level-return.html
http://forum.fractalaudio.com/axe-f...x-ii-firmware-18-01-released.html#post1168570
http://forum.fractalaudio.com/axe-f...x-ii-firmware-18-01-released.html#post1168577
http://forum.fractalaudio.com/axe-f...x-ii-firmware-18-01-released.html#post1168628
http://forum.fractalaudio.com/axe-f...ii-firmware-18-01-released-2.html#post1168722
http://forum.fractalaudio.com/axe-f...ii-firmware-18-01-released-3.html#post1168775
http://forum.fractalaudio.com/axe-f...ii-firmware-18-01-released-6.html#post1170682
http://forum.fractalaudio.com/axe-fx-ii-discussion/98637-no-sounds-computer.html
http://forum.fractalaudio.com/showthread.php?t=98685
http://forum.fractalaudio.com/axe-f...snt-work-interface-fw18-07-a.html#post1184608
http://forum.fractalaudio.com/axe-fx-ii-discussion/98838-probably-simple-question.html#post1185983
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