diff --git a/syncplay/constants.py b/syncplay/constants.py
index a506fe7..a49a148 100644
--- a/syncplay/constants.py
+++ b/syncplay/constants.py
@@ -108,12 +108,12 @@ STYLE_ERRORNOTIFICATION = "color: red;"
 STYLE_DIFFERENTITEM_COLOR = 'red'
 STYLE_NOFILEITEM_COLOR = 'blue'
 
-MPLAYER_SLAVE_ARGS = ['-slave', '--hr-seek=always', '-nomsgcolor', '-msglevel', 'all=1:global=4:cplayer=4']
+MPLAYER_SLAVE_ARGS = ['-slave', '--hr-seek=always', '-nomsgcolor', '-msglevel', 'all=1:global=4:cplayer=4', '-af', 'scaletempo']
 # --quiet works with both mpv 0.2 and 0.3
-MPV_SLAVE_ARGS = ['--hr-seek=always', '--quiet', '--keep-open']
-MPV_SLAVE_ARGS_WINDOWS = ['--slave-broken']
-MPV_SLAVE_ARGS_NONWINDOWS = ['--input-terminal=no','--input-file=/dev/stdin']
-MPV_SLAVE_ARGS_NEW = ['--term-playing-msg=<SyncplayUpdateFile>\nANS_filename=${filename}\nANS_length=${=length}\nANS_path=${path}\n</SyncplayUpdateFile>']
+MPV_SLAVE_ARGS = ['--hr-seek=always', '--quiet', '--keep-open', '-af', 'scaletempo']
+MPV_SLAVE_ARGS_WINDOWS = ['--slave-broken', '-af', 'scaletempo']
+MPV_SLAVE_ARGS_NONWINDOWS = ['--input-terminal=no','--input-file=/dev/stdin', '-af', 'scaletempo']
+MPV_SLAVE_ARGS_NEW = ['--term-playing-msg=<SyncplayUpdateFile>\nANS_filename=${filename}\nANS_length=${=length}\nANS_path=${path}\n</SyncplayUpdateFile>', '-af', 'scaletempo']
 MPV_NEW_VERSION = False
 VLC_SLAVE_ARGS = ['--extraintf=luaintf', '--lua-intf=syncplay', '--no-quiet', '--no-input-fast-seek',
                   '--play-and-pause', '--start-time=0']
@@ -133,4 +133,4 @@ INVERTED_STATE_MARKER = "*"
 ERROR_MESSAGE_MARKER = "*"
 LOAD_SAVE_MANUALLY_MARKER = "!"
 CONFIG_NAME_MARKER = ":"
-CONFIG_VALUE_MARKER = "="
\ No newline at end of file
+CONFIG_VALUE_MARKER = "="