Hear a Baritone Oboe, a Heckelphone, a Lupophone

[Enthalpy]

The baritone oboe, also called bass oboe, is a tenor, playing an octave lower the oboe's written range - I suppose it could extend more the upper register.
https://en.wikipedia.org/wiki/Bass_oboe
While the instrument is rather common in museums, and several luthiers announce it in their catalogue, recent instruments and records are rare. One example here
http://www.oboequartet.com/index.php?article_id=22
search for CD 1, click on Probehören, listen the solo from 0:05 to 0:13. Miriam Moser plays a tenor with bulb bell developed by Fossati and Rainer Egger.
One other example, music from 1:48 to 1:54, from 2:32 to 2:46 and elsewhere
https://www.youtube.com/watch?v=4rU_RiT-OXw
Andreas Mendel plays a tenor with flare bell from Mönnig.

The Heckelphone has some changes at the bulb bell and a broader bore, which here too, makes the sound deeper but not softer.
https://en.wikipedia.org/wiki/Heckelphone
one record has a nicer sound, by Katrin Stüble
Gxj0OLftfFk 0:29-1:05, 2:29-3:02, 4:34-4:51 and 5:24-6:00

The most recent Lupophone, by Guntram Wolf and Benedikt Eppelsheim
https://www.guntramwolf.de/instrumente/modern/oboen/bassoboe/lupophon
has allegedly a narrower bore, nearer to the baritone oboe
https://en.wikipedia.org/wiki/Lupophon (wouldn't a final "e" fit naturally in English?)
and it reaches the low F written by R. Strauss in his Alpensinfonie, by mistake I suppose. Big bulb bell. Record:
https://www.youtube.com/watch?v=-6gVdShhltg

[Enthalpy]

One more baritone oboe record:
jwu8WS5MAvA from 5:25 to 6:28

[Enthalpy]

The oboe d'amore sounds three semitones lower than the usual soprano, transcribing in A. It was more common at the time of Bach or Telemann, but for instance Ravel wrote for its distinctive sound, and many luthiers propose it. The bulb smaller than at the English horn gives it a less heavy resonance, and depending on the musician, the sound may become a bit grainy, but typically less so than on the English horn, or not at all.

0UM0IJ9H360 instrument begins at 1:05
wruqhsb_12M begins 0:38
-Ts3N9BndA4 begins 0:17
tDMWNfYuWrs begins 1:36
1P9iEpOhCnQ begins 0:15

Elegant, isn't it?

[Enthalpy]

The piccolo oboe is also called oboe musette. Marigaux doesn't mention it any more in its production, so I've seen it only at
loree-paris.com and patricola.com
and while the Lorée model transposes in F a fourth higher and starts at written Bb, the Patricola transposes in Eb a minor third higher and starts at written B, how convenient.

And here's one (1) record, little to make an idea of the sound:
DjE7ESvl0f8

Logically, it should be worse than a soprano oboe for the necessary pressure, the lip pain, the intonation.

 

[Enthalpy]

The oboe da caccia, a curved low oboe, was common at Bach's time, it had completely disappeared in the 19^th century and was resurrected as a historical reconstitution half a century ago. Explanations and some sounds
cPvpyI-bmEM
Its soft and dark sound differs much from the oboe and English horn, and I don't believe a word of the reasons proposed above. The diagrams I saw wanted the wooden body to have many notches which were compressed to curve the body, with a leather cover making it airtight. The huge resulting losses would naturally all high hard tone components and collapse the blowing resistance, which further helps too wide reeds play create a soft tone. Though, it must be possible to cut wedged body segments completely from an other and glue them together as a curve.

Here are listening samples without speech, and the sound is very close to the first musician, perhaps because both instruments are copies from the same museum original:
9s6qlnhueNE and sqTrDYTrRN0
nice instrument, very different from an oboe. It must be possible to modernize its production and fingerings.

[Enthalpy]

Here are the movements III and IV of the same sonata for oboe da caccia and harpsichord:
XvMXlAnhVRk and Bwzn9TB-jWg
The nice sound, not available presently in a symphonic orchestra, would be a useful addition. The instrument sounds rather easy to play.

[Enthalpy]

The Wiener oboe is still played, but essentially at the Wiener Philharmoniker, so it is uncommon
wikipedia
its fingerings differ from the usual conservatoire oboe and its bore is wider, producing a different sound. Hear it there
JG86-Tm1ddY at 00:56
and hear the Wiener cor anglais there
JG86-Tm1ddY at 01:25

The sound of the usual conservatoire oboe varies a lot among the instruments and oboists, nice example there
6m5zE9Eue9A
softer because it's narrower. An oboe is not a cornet.

More sounds by the conservatoire oboe family there
yQ0ziInWbF4
jump there to the oboe, oboe d'amore and cor anglais;
yQ0ziInWbF4 at 1:58 and 5:46 and 6:33 and 7:22 
yQ0ziInWbF4 at 4:05
yQ0ziInWbF4 at 5:02
If you wonder, the language is Portuguese. From Portugal, with a rhythm very different from Brazil. And the oboe with unusual bell shape is from Dupin.

[Enthalpy]

On 7/31/2019 at 6:20 PM, Enthalpy said:

The piccolo oboe is also called oboe musette [...]

Patricola moved their instrument's webpage to
Oboe musette
They keep now the E-flat transposition for themselves, but it can't change so easily.

The linked video is now private. Here are more:
H1XlT9tU7nQ at t=53 - 4ZAiqt_TZ38 - fzta9zlUe-M
It seems difficult to play.