[CM] snd 19.7 gtk-effects menu not working

[David O'Toole]

None of the menu options work, I get this:

;gtk_box_pack_start: unbound variable
;    (gtk_box_pack_start (GTK_BOX...
;    >gtk-effects-utils.scm, line 111
; add-sliders: (gtk_box_pack_start (GTK_BOX... ; dialog: #<GtkWidget_
0x561e45912b50>
;                                              mainform: #<GtkWidget_
0x561e3ca18820>
; add-sliders: ((gtk_widget_show mainform) ... ; use-hbox: #f
;                                              table: #<GtkWidget_
0x561e3c838870>
;                                              sliders: (("delay time"
0.0 0.5 2.0 ...)...
; ((add-target (gtk_dialog_get_content_area... ; echo-dialog:
#<GtkWidget_ 0x561e45912b50>
;                                              echo-target: sound
;                                              echo-truncate: #t
; ((activate-dialog echo-dialog))