diff --git a/app/server/ruby/lib/sonicpi/synths/synthinfo.rb b/app/server/ruby/lib/sonicpi/synths/synthinfo.rb
index cbb9d84a3a..76b97c5fee 100644
--- a/app/server/ruby/lib/sonicpi/synths/synthinfo.rb
+++ b/app/server/ruby/lib/sonicpi/synths/synthinfo.rb
@@ -4828,7 +4828,7 @@ def specific_arg_info
           :lfo_width =>
           {
             :doc => "Width of the low-frequency oscillator (LFO) which determines how wide base tones oscillate around their base frequencies; a dimensionless scaled ratio between base and peak oscillator frequencies",
-            :validations => [v_positive(:lfo_width)],
+            :validations => [v_positive(:lfo_width), v_less_than(:lfo_width, 1)],
             :modulatable => true
           },
           :lfo_rate =>
@@ -4840,7 +4840,7 @@ def specific_arg_info
           :vel =>
           {
             :doc => "The velocity of the attack, makes the sound louder and changes the timbre",
-            :validations => [v_positive(:vel)],
+            :validations => [v_positive(:vel), v_less_than(:vel, 10)],
             :modulatable => false
           },
           :mod_index =>