I just need to use an sfz

Hello and thanks so much in advance for any assistance!

I have spent many HOURS just trying to use an sfz in a Qtractor MIDI track!

At first I tried to establish a channel with the sfz in LinuxSampler via Qsampler, and using QjackCtl and Qtractor, but I didn't succeed despite following everyone's instructions. But then somebody told me it would be much easier to simply add a plugin to Qtractor. I managed to add the Calf Fluidsynth plugin, but it says my soundfont doesn't load because it's not a RIFF file (it seems it doesn't accept sfz).

I would just like to know what the easiest way is to play an sfz file in Qtractor? There's probably a very easy way that new people like me just can never find except after hours and hours of effort. I don't need any special effects or anything, my needs are extremely simple. I want to stick with Qtractor because it's piano-roll editor seems like the best available.

When I tried to use LinuxSampler, I think the problem was that again it wouldn't accept the sfz file. I mean, there were countless problems, but I think I solved all except that one, because when trying to set up a channel I'd always get the error:

Channel 0 lscp_edit_channel_instrument: Instrument editing is not supported for this instrument format (errno=100)
Instrument editing is not supported for this instrument format
Channel 0 Could not launch an appropriate instrument editor for the given instrument! Make sure you have an appropriate instrument editor like 'gigedit' installed and that it placed its mandatory DLL file into the sampler's plugin directory.

DLL is not for the sfz file format however. LinuxSampler's website clearly indicates it supports sfz, so what am I missing?

Thanks again. :)

PS - Don't know if this is related or relevant but when Qtractor is open then I can't play videos on websites such as Youtube but the videos will work again immediately upon Qtractor's closure. Same for music. Actually it seems I can't even here any sound at all when Qtractor is open, like when I press the volume up/down keys on my keyboard it usually makes a sound, but not when Qtractor is open. This is strange... I did get sound out of Qtractor once, but it was long ago and I don't know how..

EDIT: I'm trying to install LinuxSampler LV2 plugin but I get the following error:

andrew@andrew-Veriton-M680G:~$ sudo apt-get install linuxsampler-lv2
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
linuxsampler-all : Depends: linuxsampler-dssi but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
libllvm3.8 libmircommon5 libsnapd-glib1 linux-headers-4.4.0-31
linux-headers-4.4.0-31-generic linux-headers-4.4.0-87
linux-headers-4.4.0-87-generic linux-headers-4.4.0-89
linux-headers-4.4.0-89-generic linux-headers-4.4.0-91
linux-headers-4.4.0-91-generic linux-image-4.4.0-31-generic
linux-image-4.4.0-87-generic linux-image-4.4.0-89-generic
linux-image-4.4.0-91-generic linux-image-extra-4.4.0-31-generic
linux-image-extra-4.4.0-87-generic linux-image-extra-4.4.0-89-generic
linux-image-extra-4.4.0-91-generic python3-pexpect python3-pil
python3-ptyprocess python3-renderpm python3-reportlab
python3-reportlab-accel snapd-login-service ubuntu-core-launcher
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
linuxsampler-dssi linuxsampler-lv2
The following NEW packages will be installed:
linuxsampler-dssi linuxsampler-lv2
0 upgraded, 2 newly installed, 0 to remove and 87 not upgraded.
2 not fully installed or removed.
Need to get 0 B/3,357 kB of archives.
After this operation, 10.6 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 364941 files and directories currently installed.)
Preparing to unpack .../linuxsampler-dssi_1.0.0+svn2593-1kxstudio3_amd64.deb ...
Unpacking linuxsampler-dssi (1.0.0+svn2593-1kxstudio3) ...
dpkg: error processing archive /var/cache/apt/archives/linuxsampler-dssi_1.0.0+svn2593-1kxstudio3_amd64.deb (--unpack):
trying to overwrite '/usr/lib/dssi/linuxsampler.so', which is also in package liblinuxsampler 2.0.0-1+svn1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Preparing to unpack .../linuxsampler-lv2_2%3a2.0.0-2kxstudio1_amd64.deb ...
Unpacking linuxsampler-lv2 (2:2.0.0-2kxstudio1) ...
dpkg: error processing archive /var/cache/apt/archives/linuxsampler-lv2_2%3a2.0.0-2kxstudio1_amd64.deb (--unpack):
trying to overwrite '/usr/lib/lv2/linuxsampler.lv2/manifest.ttl', which is also in package liblinuxsampler 2.0.0-1+svn1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/linuxsampler-dssi_1.0.0+svn2593-1kxstudio3_amd64.deb
/var/cache/apt/archives/linuxsampler-lv2_2%3a2.0.0-2kxstudio1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)