Many species from the Parvisepalum group are pleasantly fragrant and among the most fragrant of the genus. These include delenatii, emersonii, hangianum, and malipoense. Hangianum is, to my knowledge, the most fragrant paph and can be at "room filling" level. Malipoense and delenatii are hit or miss, they run the spectrum from not fragrant at all to fairly strong. Some of the lesser known species, like jackii are also fragrant and I believe some clones of vietnamense are as well.
Primulinum usually has a sweet, yeasty smell (though strength and composition can vary by clone) like sour dough bread or beer. I think its the only species in this group (cochlopetalum) that I've noticed a fragrance on. Also, there's been a lot of careless hybridization and breeding of primulinum, so often plants labelled as primulinum are actually mislabelled and are hybrids which do not have a fragrance.
Kolopakingii can be fragrant, though usually the scent is a musk sort of like sweat or old urine and described as gross. Other multiflorals in this group are fragrant, too, such as rothschildianum, with a light black pepper floral scent.
Some of the Brachies are fragrant, for instance concolor. However, the scents can be unpleasant. I've heard concolor described as apple scented, yet I'd describe it more as putrid vomit with a note of apple peel.
I have a lowii that I swear is fragrant, too, though most sources will say it's not and most people familiar with paphs will think you're crazy. I'll also note that I was only able to detect a fragrance on one blooming of my plant, but not subsequent bloomings. So there may be some environmental factors (like light spectrum, temp, etc) that comes into play.
Obviously hybrids involving these species I've mentioned can be fragrant, so keep your eyes open for Shun-fa Golden (hangianum x malipoense), LynLeigh Koopowitz (malipoense x delenatii), Prime Child (rothschildianum x primulinum) , and things like that. There are hybrids like Dr. Toot (delenatii x kolopakingii), Paph. Honey (primulinum x philippinense), Paph. Memoria Larry Heuer (malipoense x emersonii) that often also have faint fragrance.
Additionally, if you include Phrags in your list, then species to look at would be schlimii (rosey scent, varying degrees of strength) and some of the caudatum types (which feature musky sweat and urine scents with floral/cologne notes). Schlimii hybrids like Hanne Popow and Eumelia Arias are also often fragrant, and for some reason, the hybrids tend to be more strongly scented. For whatever reason, both of these fragrances are scents that some people can smell, other's can't. For awhile people made me feel ridiculous for saying that some of my popowii/humboldtii hybrids had a fragrance, but I'm 100% certain of it now, and more folks are recognizing it.
Overall, fragrance in tropical slippers is highly variable from clone to clone in terms of intensity and sometimes even the scent can be quite variable. There's also the issue that scent is a lot more subjective than some of our other senses. So, some people might smell a fragrance and say it's rose, another might say it's raspberries, and yet another might not smell anything at all. Combine this with the fact that almost nobody is breeding Paphs specifically for fragrance, instead choosing the prettiest and shapeliest flowers to breed with and ignoring scent almost entirely, and it's easy to understand why people tend to think of Paphs and Phrags as not being fragrant (because most aren't).
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