All voice files on Yamaha arranger keyboards and Clavinova digital pianos (including files with extensions *.clv, *.drm, *.liv, *.mqv, *.sar, *.sfx, *.swv, *.vce, *.nlv, amongst others) are in reality small (< 1k) disguised MIDI files, that just do the set-up of the requested voice and its parameters. For instance, I've taken one file in your archive (C7 Atmosphere.T230.nlv - by the way, the T230 in the filename identifies the icon to show for this instrument), and decoded it so you see what is inside.
* [001:1:0005] 05 FF 58 04 04 02 18 08 # Time Signature = 4/4 [24 clocks/tick, 8 32nd notes per quarter]
* [001:1:0010] 05 FF 51 03 07 A1 20 # Tempo : ♩ = 120 (500000 us/Quarter)
* + [001:1:0015] 05 B0 00 68 # [CH:1 - (00) Bank Select MSB = 104 (68H)]
* + [001:1:0020] 05 B0 20 18 # [CH:1 - (20) Bank Select LSB = 24 (18H)]
* + [001:1:0025] 05 C0 05 # [CH:1 - PRG = 5 (05H)]
* ++[001:1:0025] ++ # CH:1 - Voice Set: C7 Atmosphere [MSB/LSB/PRG = 104/24/5 (68H/18H/05H)]
* [001:1:0030] 05 B0 48 74 # CH:1 - (48) Release Time = 52 (74H)
* + [001:1:0035] 05 B0 63 01 # [CH:1 - (63) NRPN MSB = 1 (01H)]
* + [001:1:0040] 05 B0 62 66 # [CH:1 - (62) NRPN LSB = 102 (66H)]
* + [001:1:0045] 05 B0 06 40 # [CH:1 - (06) Data Entry MSB = 64 (40H)]
* + [001:1:0050] 05 B0 26 00 # [CH:1 - (26) Data Entry LSB = 0 (00H)]
* ++[001:1:0050] ++ # CH:1 - NRPN #0166H: EG Release = 0 (40H)
* [001:1:0055] 05 B0 49 40 # CH:1 - (49) Attack Time = 0 (40H)
* + [001:1:0060] 05 B0 63 01 # [CH:1 - (63) NRPN MSB = 1 (01H)]
* + [001:1:0065] 05 B0 62 64 # [CH:1 - (62) NRPN LSB = 100 (64H)]
* + [001:1:0070] 05 B0 06 40 # [CH:1 - (06) Data Entry MSB = 64 (40H)]
* + [001:1:0075] 05 B0 26 00 # [CH:1 - (26) Data Entry LSB = 0 (00H)]
* ++[001:1:0075] ++ # CH:1 - NRPN #0164H: EG Decay Time = 0 (40H)
* + [001:1:0080] 05 B0 63 01 # [CH:1 - (63) NRPN MSB = 1 (01H)]
* + [001:1:0085] 05 B0 62 08 # [CH:1 - (62) NRPN LSB = 8 (08H)]
* + [001:1:0090] 05 B0 06 40 # [CH:1 - (06) Data Entry MSB = 64 (40H)]
* + [001:1:0095] 05 B0 26 00 # [CH:1 - (26) Data Entry LSB = 0 (00H)]
* ++[001:1:0095] ++ # CH:1 - NRPN #0108H: Vibrato Rate = 0 (40H)
* + [001:2:0004] 05 B0 63 01 # [CH:1 - (63) NRPN MSB = 1 (01H)]
* + [001:2:0009] 05 B0 62 09 # [CH:1 - (62) NRPN LSB = 9 (09H)]
* + [001:2:0014] 05 B0 06 40 # [CH:1 - (06) Data Entry MSB = 64 (40H)]
* + [001:2:0019] 05 B0 26 00 # [CH:1 - (26) Data Entry LSB = 0 (00H)]
* ++[001:2:0019] ++ # CH:1 - NRPN #0109H: Vibrato Depth = 0 (40H)
* + [001:2:0024] 05 B0 63 01 # [CH:1 - (63) NRPN MSB = 1 (01H)]
* + [001:2:0029] 05 B0 62 0A # [CH:1 - (62) NRPN LSB = 10 (0AH)]
* + [001:2:0034] 05 B0 06 40 # [CH:1 - (06) Data Entry MSB = 64 (40H)]
* + [001:2:0039] 05 B0 26 00 # [CH:1 - (26) Data Entry LSB = 0 (00H)]
* ++[001:2:0039] ++ # CH:1 - NRPN #010AH: Vibrato Delay = 0 (40H)
* [001:2:0044] 05 F0 08 43 10 4C 08 00 1E 1E F7 # [XG] CH:1 - MW Low Pass Filter Control = -5100 cent (1EH)
* [001:2:0049] 05 F0 08 43 10 4C 0A 00 40 40 F7 # [XG] CH:1 - MW Offset Level Control = 0,0% (40H)
* [001:2:0054] 05 F0 08 43 10 4C 08 00 20 00 F7 # [XG] CH:1 - MW LFO PMOD Depth = 0 (00H)
* [001:2:0059] 05 F0 08 43 10 4C 08 00 21 00 F7 # [XG] CH:1 - MW LFO FMOD Depth = 0 (00H)
* [001:2:0064] 05 F0 08 43 10 4C 08 00 22 00 F7 # [XG] CH:1 - MW LFO AMOD Depth = 0 (00H)
* [001:2:0069] 05 F0 08 43 10 4C 08 00 4E 40 F7 # [XG] CH:1 - CAT Low Pass Filter Control = 0 cent (40H)
* [001:2:0074] 05 F0 08 43 10 4C 0A 00 42 40 F7 # [XG] CH:1 - CAT Offset Level Control = 0,0% (40H)
* [001:2:0079] 05 F0 08 43 10 4C 08 00 50 00 F7 # [XG] CH:1 - CAT LFO PMOD Depth = 0 (00H)
* [001:2:0084] 05 F0 08 43 10 4C 08 00 51 00 F7 # [XG] CH:1 - CAT LFO FMOD Depth = 0 (00H)
* [001:2:0089] 05 F0 08 43 10 4C 08 00 52 00 F7 # [XG] CH:1 - CAT LFO AMOD Depth = 0 (00H)
* [001:2:0094] 05 F0 08 43 10 4C 08 00 5B 40 F7 # [XG] CH:1 - AC1 Low Pass Filter Control = 0 cent (40H)
* [001:3:0003] 05 F0 08 43 10 4C 0A 00 44 28 F7 # [XG] CH:1 - AC1 Offset Level Control = -37,5% (28H)
* [001:3:0008] 05 F0 08 43 10 4C 08 00 5D 00 F7 # [XG] CH:1 - AC1 LFO PMOD Depth = 0 (00H)
* [001:3:0013] 05 F0 08 43 10 4C 08 00 5E 00 F7 # [XG] CH:1 - AC1 LFO FMOD Depth = 0 (00H)
* [001:3:0018] 05 F0 08 43 10 4C 08 00 5F 00 F7 # [XG] CH:1 - AC1 LFO AMOD Depth = 0 (00H)
* [001:3:0023] 05 F0 08 43 10 4C 08 00 05 01 F7 # [XG] CH:1 - Mono/Poly Mode = Poly
* [001:3:0028] 05 F0 09 43 73 01 50 08 00 04 73 F7 # [CLAVI] CH:1 - Voice: Set Volume = 115 (73H)
* [001:3:0033] 05 B0 47 40 # CH:1 - (47) Harmonic Content = 0 (40H)
* [001:3:0038] 05 B0 4A 40 # CH:1 - (4A) Brightness = 0 (40H)
* [001:3:0043] 05 B0 05 00 # CH:1 - (05) Portamento Time = 0 (00H)
* [001:3:0048] 05 F0 08 43 10 4C 08 00 0C 42 F7 # [XG] CH:1 - Velocity Sense Depth = 66 (42H)
* [001:3:0053] 05 F0 08 43 10 4C 08 00 0D 3F F7 # [XG] CH:1 - Velocity Sense Offset = 63 (3FH)
* [001:3:0058] 05 F0 09 43 73 01 50 08 00 05 40 F7 # [CLAVI] Voice: Right (R1/R2/R3) Octave = 0 (40H)
* [001:3:0063] 05 F0 09 43 73 01 50 08 03 06 41 F7 # [CLAVI] Voice: Left (L) Octave = 1 (41H)
* [001:3:0068] 05 F0 08 43 10 4C 0A 00 02 00 F7 # [XG] CH:1 - #0A:00:02 = 00H F7H
* [001:3:0073] 05 F0 08 43 10 4C 0A 00 03 00 F7 # [XG] CH:1 - #0A:00:03 = 00H F7H
* [001:3:0078] 05 F0 08 43 10 4C 08 00 76 19 F7 # [XG] CH:1 - EQ Bass Frequency = 355Hz (19H)
* [001:3:0083] 05 F0 08 43 10 4C 08 00 72 40 F7 # [XG] CH:1 - EQ Bass Gain = 0 dB (40H)
* [001:3:0088] 05 F0 08 43 10 4C 08 00 77 2B F7 # [XG] CH:1 - EQ Treble Frequency = 2.8kHz (2BH)
* [001:3:0093] 05 F0 08 43 10 4C 08 00 73 40 F7 # [XG] CH:1 - EQ Treble Gain = 0 dB (40H)
* [001:4:0002] 05 F0 0B 43 73 01 51 04 00 00 02 01 00 F7 # [CLAVI] Voice: Echo/Harmony Type = Standard Trio (01H 00H)
* [001:4:0007] 05 F0 09 43 73 01 50 04 00 05 40 F7 # [CLAVI] Voice: Echo/Harmony Volume = 64 (40H)
* [001:4:0012] 05 F0 09 43 73 01 50 04 00 02 10 F7 # [CLAVI] Voice: Echo/Harmony Assign = Auto (10H)
* [001:4:0017] 05 F0 09 43 73 01 50 04 00 03 00 F7 # [CLAVI] Voice: Echo/Harmony Chord Note Only = Off
* [001:4:0022] 05 F0 09 43 73 01 50 04 00 04 00 F7 # [CLAVI] Voice: Echo/Harmony Touch Limit = 0 (00H)
* [001:4:0027] 05 B0 5B 1C # CH:1 - (5B) Effect1 Depth (Reverb Send Level) = 28 (1CH)
* [001:4:0032] 05 B0 5D 0C # CH:1 - (5D) Effect3 Depth (Chorus Send Level) = 12 (0CH)
* [001:4:0037] 05 F0 09 43 73 01 50 08 00 08 7F F7 # [CLAVI] CH:1 - Voice: DSP Effect = On
* [001:4:0042] 05 F0 09 43 73 01 50 08 00 01 00 F7 # [CLAVI] CH:1 - Voice: DSP Variation = Off
* [001:4:0047] 05 F0 09 43 10 4C 03 00 00 7B 08 F7 # [XG] Insertion Effect 1 (DSP2) Type = Damper Resonance (7BH 08H)
* [001:4:0052] 05 F0 08 43 10 4C 03 00 0B 20 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 10 = 32 (20H)
* [001:4:0057] 05 F0 0B 43 73 01 51 08 00 11 02 28 00 F7 # [CLAVI] CH:1 - Voice: DSP Variation Parameter = 10240 (28H 00H)
* [001:4:0062] 05 F0 08 43 10 4C 03 00 02 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 1 = 0 (00H)
* [001:4:0067] 05 F0 08 43 10 4C 03 00 03 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 2 = 0 (00H)
* [001:4:0072] 05 F0 08 43 10 4C 03 00 04 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 3 = 0 (00H)
* [001:4:0077] 05 F0 08 43 10 4C 03 00 05 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 4 = 0 (00H)
* [001:4:0082] 05 F0 08 43 10 4C 03 00 06 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 5 = 0 (00H)
* [001:4:0087] 05 F0 08 43 10 4C 03 00 07 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 6 = 0 (00H)
* [001:4:0092] 05 F0 08 43 10 4C 03 00 08 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 7 = 0 (00H)
* [002:1:0001] 05 F0 08 43 10 4C 03 00 09 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 8 = 0 (00H)
* [002:1:0006] 05 F0 08 43 10 4C 03 00 0A 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 9 = 0 (00H)
* [002:1:0011] 05 F0 08 43 10 4C 03 00 20 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 11 = 0 (00H)
* [002:1:0016] 05 F0 08 43 10 4C 03 00 21 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 12 = 0 (00H)
* [002:1:0021] 05 F0 08 43 10 4C 03 00 22 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 13 = 0 (00H)
* [002:1:0026] 05 F0 08 43 10 4C 03 00 23 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 14 = 0 (00H)
* [002:1:0031] 05 F0 08 43 10 4C 03 00 24 00 F7 # [XG] Insertion Effect 1 (DSP2) Parameter 15 = 0 (00H)
* [002:1:0036] 05 F0 08 43 10 4C 03 00 25 5A F7 # [XG] Insertion Effect 1 (DSP2) Parameter 16 = 90 (5AH)
* [002:1:0041] 05 F0 0C 43 73 01 51 08 00 12 03 09 00 28 F7 # [CLAVI] SysEx - * no further analysis available *
* [002:1:0046] 05 FF 2F 00 # ** END OF TRACK **
The really important lines are 3-6, which send the MIDI commands to set a voice with MSB/LSB/Program Change of 104/24/5 (5 is 6 in Yamaha charts), which corresponds to... "C7 Atmosphere". So, these commands instruct the keyboard to use the internal sound corresponding to C7 Atmosphere. The rest of the file is used to set some parameters with values optimized for the keyboard (which can be edited under Voice Edit).
What this file does not contain is the actual samples. These are inside the Genos (in this case) in the Wave Flash Memory, which is completely inaccessible. When you create a bank with YEM it will be written in the user part of the internal Wave Flash Memory. Genos (and Tyros) keyboard allow the re-use of internal wave files in YEM, whereas with PSR-S/PSR-SX keyboards, only new wave files can be used.
AFAIK, there is no way to extract waves from one keyboard to use on another (and much less if those waves use unavailable features, like Revo! Drums and Super Articulation 2!).
Regards!