hello
I m running Thief Gold in a Win10 system and i dont have sound when i start a new game
I mean in the mission

Any solution please?

try different hw acceleration settings under the audio options.

are you running a standalone sound card by any chance?

I use the inboard sound cart

I have sound in starter screens as option etc but not in game
Also speaker test in sound option screen don't work....

tried with hw acceleration off?

post your thief.log.

Ok here:

PID: 11432
: CPU: arch=x86-64 , fam=586 , cpus=4
: SIMD: SSE=3 , 3DNow=0 , MMX=1
: OS Version: 6.2.9200
: Desktop resolution: 1920 x 1200
: Virtual desktop resolution: 1920 x 1200
: -----------------------------------------------------------
: Command line: "C:\Program Files (x86)\GOG Games\Thief Gold\THIEF.EXE"
: -----------------------------------------------------------
: CWD: C:\Program Files (x86)\GOG Games\Thief Gold
: -----------------------------------------------------------
: App Version: Thief 2 Final 1.26
: --------------------- misc config -------------------------
: resname_base .\RES
: load_path .\
: script_module_path .\
: movie_path .\MOVIES
: mod_path patches
: install_path .\
: language english
: game_screen_size 640 480
: game_screen_depth 16
: game_screen_flags 13
: game_full_screen 1
: game_hardware 1
: single_display_mode 2
: ui_scale_mode 2
: use_d3d_display
: framerate_cap 100.0
: SlowFrame 4
: SlowFrameUI 10
: force_32bit
: force_32bit_textures
: mipmap_mode 2
: lm_mipmap_mode 0
: lm_init_texmem 2
: lm_filter_margin 1
: tex_edge_padding 2
: alpha_test_as_opaque
: d3d_disp_enable_atoc 1
: multisampletype 8
: d3d_disp_enable_distortionfx
: sfx_device 1
: sfx_channels 8
: game dark
: dark1
: obj_min -6144
: obj_max 2048
: max_refs 8192
: gui_font intrface\smalfont
: new_mantle
: z_far 512
: wr_render_zcomp
: render_weapon_particles
: legacy_force_match_unrefs 0
: dark_zcomp_arm
: -----------------------------------------------------------
: Enumerating D3D9 adapters (1)...
: Adapter 0
: device name: \\.\DISPLAY1
: driver : aticfx32.dll
: descr : Radeon RX550/550 Series
: driver ver : 0x001A0014-3AA703EF
: vendor id : 0x00001002
: device id : 0x0000699F
: subsys id : 0xE3671DA2
: device guid: D7B71EE2-2ADF-11CF-FD7D-C0F97CC2
: desktop res: 1920 x 1200
: Modes
: 640 x 480 x 16
: unsupported mode 720 x 400 x 16 (not in mode table)
: unsupported mode 720 x 400 x 16 (not in mode table)
: 800 x 600 x 16
: unsupported mode 832 x 624 x 16 (not in mode table)
: unsupported mode 832 x 624 x 16 (not in mode table)
: 1024 x 768 x 16
: 1152 x 864 x 16
: unsupported mode 1152 x 872 x 16 (not in mode table)
: unsupported mode 1152 x 872 x 16 (not in mode table)
: 1280 x 720 x 16
: 1280 x 800 x 16
: 1280 x 960 x 16
: 1280 x 1024 x 16
: 1600 x 1200 x 16
: 1680 x 1050 x 16
: 1920 x 1080 x 16
: 1920 x 1200 x 16
: 640 x 480 x 32
: unsupported mode 720 x 400 x 32 (not in mode table)
: unsupported mode 720 x 400 x 32 (not in mode table)
: 800 x 600 x 32
: unsupported mode 832 x 624 x 32 (not in mode table)
: unsupported mode 832 x 624 x 32 (not in mode table)
: 1024 x 768 x 32
: 1152 x 864 x 32
: unsupported mode 1152 x 872 x 32 (not in mode table)
: unsupported mode 1152 x 872 x 32 (not in mode table)
: 1280 x 720 x 32
: 1280 x 800 x 32
: 1280 x 960 x 32
: 1280 x 1024 x 32
: 1600 x 1200 x 32
: 1680 x 1050 x 32
: 1920 x 1080 x 32
: 1920 x 1200 x 32
: Device Validation
: validated ok, device added (0, E390000)
: Enumeration done
: D3DProvider: Enumerating adapter 0 modes
: 640 x 480 x 16
: unsupported mode 720 x 400 x 16 (not in mode table)
: unsupported mode 720 x 400 x 16 (not in mode table)
: 800 x 600 x 16
: unsupported mode 832 x 624 x 16 (not in mode table)
: unsupported mode 832 x 624 x 16 (not in mode table)
: 1024 x 768 x 16
: 1152 x 864 x 16
: unsupported mode 1152 x 872 x 16 (not in mode table)
: unsupported mode 1152 x 872 x 16 (not in mode table)
: 1280 x 720 x 16
: 1280 x 800 x 16
: 1280 x 960 x 16
: 1280 x 1024 x 16
: 1600 x 1200 x 16
: 1680 x 1050 x 16
: 1920 x 1080 x 16
: 1920 x 1200 x 16
: 640 x 480 x 32
: unsupported mode 720 x 400 x 32 (not in mode table)
: unsupported mode 720 x 400 x 32 (not in mode table)
: 800 x 600 x 32
: unsupported mode 832 x 624 x 32 (not in mode table)
: unsupported mode 832 x 624 x 32 (not in mode table)
: 1024 x 768 x 32
: 1152 x 864 x 32
: unsupported mode 1152 x 872 x 32 (not in mode table)
: unsupported mode 1152 x 872 x 32 (not in mode table)
: 1280 x 720 x 32
: 1280 x 800 x 32
: 1280 x 960 x 32
: 1280 x 1024 x 32
: 1600 x 1200 x 32
: 1680 x 1050 x 32
: 1920 x 1080 x 32
: 1920 x 1200 x 32
: D3DProvider: Enumeration done
: sw framerate cap requested (10000 us)
: D3DProvider StartMode: smode 640x480x32 ; mode 640x480x32 (5 9 0 2D) ; 2d_surf_mode: 0
: CreateDevice: res = D3D_OK ; 640x480 fmt=22 zfmt=75 cnt=1 ms=8 swap=1 fs=1 hz=0 pres=1 flags=2
: sw framerate cap requested (10000 us)
: D3DProvider StartMode: smode 1920x1200x32 ; mode 640x480x32 (5 9 0 2D) ; 2d_surf_mode: 0
: CreateDevice: res = D3D_OK ; 1920x1200 fmt=22 zfmt=75 cnt=1 ms=8 swap=1 fs=1 hz=0 pres=1 flags=2
: Loaded script module "miss02.osm" [FileModDate=2020-Apr-15]
: Loaded script module "script-t1.osm" [FileVer=2.1.0.0 ; ProductVer=2.1.0.0 ; FileModDate=2020-Apr-15]
: sw framerate cap requested (10000 us)
: D3DProvider StartMode: smode 1920x1200x32 ; mode 1920x1200x32 (7 9 1 3D) ; 2d_surf_mode: 3
: sw framerate cap requested (10000 us)
: D3DProvider StartMode: smode 1920x1200x32 ; mode 640x480x32 (5 9 1 2D) ; 2d_surf_mode: 0

the game is in program files, copy it elsewhere and see whether the copy has the same issue. you can also try the standalone Thief2 demo and check as well.

tried those different audio settings?