Philips notes that by 1931 the Vienna Philharmonic strings were reported to use uniform bowing, which was still unusual in Britain. As for portamento – sliding audibly from one note to another, a prominent effect among pre-war string players – the VPO strings' sliding in the early 1930s "sounds more deliberately expressive, and less a matter of routine, than that of British orchestras. This is partly because of the firmer dynamic shaping of the melodic line, partly because of the warmer and fuller string tone." Further, he hears "strong evidence of a free approach to portamento" – that is, of "different players shifting at different points" within the same phrase (which, he shows, was standard internationally in pre-war orchestral playing). He notices a reduced use of portamento in recordings from 1931 to 1936, but in 1936 also notes that the VPO strings still make "conspicuous" use of portamento in Mozart, where British orchestras by this time were using less of it in Classical-era composers. Finally, he hears a "trend towards greater subtlety in the use of portamento" post-war, with "only discreet portamento" in a recording under Herbert von Karajan in 1949.