A comparison of eurorack VCOs. Many, many VCOs:

0:00 Intro
0:41 MakeNoise STO
3:05 Sputnik Modular Oscillator
5:54 Fonitronik/Thomas Henry X4046
8:21 GStorm Electro 4027
10:52 Fonitronik/Thomas Henry VCO Maximus
14:43 Frequency Central XVCO Two
16:49 ACL Variable Sync VCO
18:40 Dannysound Cali Osc
23:07 Random*Source / Serge NTO New Timbral Oscillator
25:56 ElectroSmith 3340
28:10 Erica Synths Polivoks II Oscillator
30:16 Befaco Even VCO
33:12 Bubblesound VCOb
35:21 Intellijel Dixie II+
37:57 Grp VCO
41:38 Verbos Foundation Oscillator
45:02 Synthesis Technology E300 Ultra VCO
48:43 Studio Electronics Oscillation
52:25 AJH Synth MiniMod
55:22 Steffcorp 2600