These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.65 s (backtrack: 0/20).

[ebuild  N     ] media-libs/alsa-topology-conf-1.2.5.1-r1::gentoo  USE="-verify-sig" 12 KiB
[ebuild  N     ] media-libs/alsa-ucm-conf-1.2.16.1::gentoo  USE="-verify-sig" 83 KiB
[ebuild  N     ] media-libs/libsamplerate-0.2.2::gentoo  USE="-test" 3242 KiB
[ebuild  N     ] sci-libs/fftw-3.3.10-r1:3.0/3::gentoo  USE="openmp threads -doc -fortran -mpi -test (-zbus)" CPU_FLAGS_X86="avx avx2 fma3 sse sse2 -fma4" 4047 KiB
[ebuild  N     ] acct-group/realtime-0-r2::gentoo  0 KiB
[ebuild  N     ] sys-auth/realtime-base-0.1-r1::gentoo  0 KiB
[ebuild  N     ] media-libs/alsa-lib-1.2.16.1::gentoo  USE="python -debug -doc -verify-sig" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13 (-python3_15)" 1104 KiB
[ebuild     U  ] dev-python/dbus-python-1.5.0::gentoo [1.4.0::gentoo] USE="-doc -examples -test" PYTHON_TARGETS="python3_14* -python3_12 -python3_13* (-python3_15) (-python3_11%)" 200 KiB
[ebuild  N     ] media-sound/jack2-1.9.22:2::gentoo  USE="alsa classic dbus pam tools -doc -ieee1394 -libsamplerate -metadata -opus (-systemd)" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13" 943 KiB
[ebuild  N     ] virtual/jack-2::gentoo  0 KiB
[ebuild  N     ] media-sound/jack-example-tools-4::gentoo  USE="alsa readline -jack-net -jack-netsource -opus -sndfile -zalsa" 123 KiB
[ebuild  N     ] media-sound/brutefir-1.0o::gentoo  241 KiB

Total: 12 packages (1 upgrade, 11 new), Size of downloads: 9992 KiB