For ッ before p, t, k, such as バック, it sounds to be voiceless.

But what happens if it is before b, d, g? This situation rarely occurs in
Japanese, but sometimes exists in loanwords. Examples would be バッグ or ベッド.

Since there are so few examples, I'm not sure how it's pronounced. Should the
ッ syllable sound voiced or voiceless? Any differences from the case before p,
t, k?
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pronunciation katakana
How does ッ pronounce before b, d, g (バッグ, ベッド)?
The small ッ cannot be pronounced on its own. In other words, there is no such
thing as "the ッ syllable". Discussing whether it's voiced or not is as
meaningless as discussing whether punctuation marks (`,`, `?`, `!`) and
diacritics are voiced or not. Although they may affect how surrounding
characters are pronounced, they cannot be pronounced in isolation.

If you mean the next consonant after the small-tsu, such as ド as in ベッド, yes,
it will be voiced as it is written. ド in ベッド is voiced, like _d_ in _bed_ ,
and ト in ベット is unvoiced ( _t_ in _bet_ ).
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There is almost always a glottal stop between the two syllables either side of
the ッ, which might be what you mean by "sounds voiceless".
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Without regard to k/g, t/d, p/b, set your lip and tongue in the same shape and
position as you pronounce the consonant which immediately follows `ッ` and
**completely shut the outflow of air momentarily** , which is the state of
`ッ`.

The exceptions I could find were:

  1. the case of following `ch` such as `きっちり`, `ぽっちゃり`, etc. where the shape and position of the tongue are those for `t` which reminds us of `tch` notations like `pitch` in English and
  2. the case of following `s` such as `あっさり`, `ぐっすり`, `こっそり`, etc. where `sssss` sound takes place without shutting the air outflow (probably because our teeth is not airtight). `s` could have taken the same strategy as `ch` and put silent `t` in front to avoid air leakage, but it didn't. (Precisely there are cases such as `まっすぐ` pronounced as `まっつぐ`, but very very local.)

I personally do not know any words in which `ッ` is followed by `j` (voiced
`ch`) or `z` (voiced `s`).
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I don't have much first-hand experience, since I don't speak Japanese.
However, I have read some phonetic studies that have some relevant
information.

As [naruto's answer](https://japanese.stackexchange.com/a/99322/30606)
explains, the basic pronunciation of ッ is not a separate sound, but a
lengthening of the following consonant sound. When it occurs before p, t, k,
the pronunciation is generally transcribed phonetically as a long or
"geminate" consonant, written in the IPA as [pp], [tt], [kk] or [pː], [tː],
[kː]. (This is not the same thing as a glottal stop, although it may sound
similar.)

So the pronunciation we would expect for ッ before b, d, g is simply [bb],
[dd], [ɡɡ] or equivalently, [bː], [dː], [ɡː]: a long (or geminate) voiced
plosive.

However, there is some linguistic literature that indicates that voiced
geminate consonants in Japanese are sometimes "devoiced", making them sound
more like [pː], [tː], [kː]. Here are some papers on this that I found:

  * "[Partial devoicing of voiced geminate stops in Tokyo Japanese](https://asa.scitation.org/doi/10.1121/1.5078605)", _The Journal of the Acoustical Society of America_ 145, 149 (2019), by Qandeel Hussain and Shigeko Shinohara

  * "[Geminate devoicing in Japanese loanwords: Theoretical and experimental investigations](http://roa.rutgers.edu/content/article/files/1321_kawahara_1.pdf)", 31 March 2015, by Shigeto Kawahara. Two examples given where devoicing may occur are /baggu/ or /bakku/ ‘bag’ and /doggu/ or /dokku/ ‘dog’. This article says that "the devoicing of geminates occurs only when there is another voiced obstruent within the same morpheme" (page 2).

I think I hear devoicing in the first pronunciation of ["バッグ" on
Forvo](https://forvo.com/word/%E3%83%90%E3%83%83%E3%82%B0/) (by gordon3155),
although I'm not certain.
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